Chapter 30
... Crust facing Earth is 60km thick Crust facing away from Earth is up to 100km thick. Beneath crust is the mantle Mantle depth = 1000km Core: possibly molten, possibly iron, less than 700km Almost no magnetic field, but local areas of magnetism exist, suggesting a solid core. ...
... Crust facing Earth is 60km thick Crust facing away from Earth is up to 100km thick. Beneath crust is the mantle Mantle depth = 1000km Core: possibly molten, possibly iron, less than 700km Almost no magnetic field, but local areas of magnetism exist, suggesting a solid core. ...
T2 Precambrian Geology Homework KEY
... (c) the Sun’s radiation pressure, i.e. the solar wind. (d) action of plate tectonics. 21) Earth’s first permanent atmosphere was mostly formed by: (a) the Earth’s magnetic field. (b) volcanic outgassing. (c) the Sun’s radiation pressure. (d) asteroid collision. ...
... (c) the Sun’s radiation pressure, i.e. the solar wind. (d) action of plate tectonics. 21) Earth’s first permanent atmosphere was mostly formed by: (a) the Earth’s magnetic field. (b) volcanic outgassing. (c) the Sun’s radiation pressure. (d) asteroid collision. ...
geology of the tavan har area, gobi, mongolia
... “The Tavan Har Impact Crater, Eastern Gobi, Mongolia” The impact crater of the northeastern Tavan Har region is located in greenschist facies metamorphic rocks with both felsic and mafic protoliths. The crater has a diameter of 1.75 km and covers an area of 137 hectares. At least two episodes of def ...
... “The Tavan Har Impact Crater, Eastern Gobi, Mongolia” The impact crater of the northeastern Tavan Har region is located in greenschist facies metamorphic rocks with both felsic and mafic protoliths. The crater has a diameter of 1.75 km and covers an area of 137 hectares. At least two episodes of def ...
Terrestrial and Extraterrestrial Basalts
... geochemical research by Michael Drake and computer models by Jay Melosh and colleagues. • Impact occurs soon after Earth’s core formation event because of the small lunar Fe core and difference in bulk density (rMoon = 3.3 g/cc << rEarth = 5.5 g/cc). • Impact event must occur before formation of the ...
... geochemical research by Michael Drake and computer models by Jay Melosh and colleagues. • Impact occurs soon after Earth’s core formation event because of the small lunar Fe core and difference in bulk density (rMoon = 3.3 g/cc << rEarth = 5.5 g/cc). • Impact event must occur before formation of the ...
2 Precambrian Geology Homework a
... 14) The largest belt of folded rocks indicating Proterozoic continental collisions is called the: a) Grenville Orogen. b) Trans-Hudson Orogen.. c) Mazatal Orogen. d) Wopmay Orogen 15) The last major Proterozoic collision before assembly of Rodinia is recorded by rocks in the: a) Grenville Orogen.. ...
... 14) The largest belt of folded rocks indicating Proterozoic continental collisions is called the: a) Grenville Orogen. b) Trans-Hudson Orogen.. c) Mazatal Orogen. d) Wopmay Orogen 15) The last major Proterozoic collision before assembly of Rodinia is recorded by rocks in the: a) Grenville Orogen.. ...
Half-life
... supported, although some indirect evidence suggests an impact did occur during the Permian, although possibly not at the time of the extinction crisis. ...
... supported, although some indirect evidence suggests an impact did occur during the Permian, although possibly not at the time of the extinction crisis. ...
FACIES ANALYSIS AND BASIN ARCHITECTURE OF THE UPPER
... the opportunity to directly test hypotheses regarding past climate through understanding the past environments recorded by sedimentary facies. Gale crater is located on fluvially dissected, cratered, highlands crust, along the Martian topographic dichotomy boundary. The crater formed at ~3.8-3.6 Ga ...
... the opportunity to directly test hypotheses regarding past climate through understanding the past environments recorded by sedimentary facies. Gale crater is located on fluvially dissected, cratered, highlands crust, along the Martian topographic dichotomy boundary. The crater formed at ~3.8-3.6 Ga ...
Saltpan impact crater, South Africa: Geochemistry of target rocks
... of the Saltpan crater a perfectly circular depression with a diameter of about 400 m was recently discovered (BRANDT et al., 1993a,b, 1994). Complete lack of exposure and only limited, still inconclusive geophysical evidence (BRANDT et al., 1993a,b, 1994) have so far precluded positive identificatio ...
... of the Saltpan crater a perfectly circular depression with a diameter of about 400 m was recently discovered (BRANDT et al., 1993a,b, 1994). Complete lack of exposure and only limited, still inconclusive geophysical evidence (BRANDT et al., 1993a,b, 1994) have so far precluded positive identificatio ...
Abundances and isotopic compositions of rare gases in granites
... argon, krypton and xenon released from four specimens of granites in stepwise-heating experiments. These rocks contained appreciable amounts of 40Ar from the decay of 40K and 131-136Xe from the 238U spontaneous fission. The contents of neon, argon (excluding 40Ar), krypton and xenon in these granite ...
... argon, krypton and xenon released from four specimens of granites in stepwise-heating experiments. These rocks contained appreciable amounts of 40Ar from the decay of 40K and 131-136Xe from the 238U spontaneous fission. The contents of neon, argon (excluding 40Ar), krypton and xenon in these granite ...
chart_set_5
... Orbital period = 225 days Rotation period = 243 days (longer than orbital period, and retrograde!) ...
... Orbital period = 225 days Rotation period = 243 days (longer than orbital period, and retrograde!) ...
Vocabulary Chapter 14
... Endosymbiont theory States that the ancestors of eukaryotic cells lived in association with prokaryotic cells ...
... Endosymbiont theory States that the ancestors of eukaryotic cells lived in association with prokaryotic cells ...
Differentiated impact melt sheets may be a
... the relative contribution of each lithology to total zircon delivery into a hypothetical detrital system, but also those from affected footwall and basin fill lithologies. We question whether the sparse data from two other impact craters are any more representative of impact melt sheet zircon yields ...
... the relative contribution of each lithology to total zircon delivery into a hypothetical detrital system, but also those from affected footwall and basin fill lithologies. We question whether the sparse data from two other impact craters are any more representative of impact melt sheet zircon yields ...
the geology of the moon
... craters large enough to be seen with Earth bound telescopes. DOMES Small surface bulges within the maria areas, whose heights are 100 meters or so and diameters of several kilometers. MASCONS Areas of very high mass concentration that lie beneath regular shaped maria, of debateable origin. RIL ...
... craters large enough to be seen with Earth bound telescopes. DOMES Small surface bulges within the maria areas, whose heights are 100 meters or so and diameters of several kilometers. MASCONS Areas of very high mass concentration that lie beneath regular shaped maria, of debateable origin. RIL ...
Meteorite Impacts as Triggers to Large Igneous Provinces
... (MORB), but with isotopic characteristics more like those of ocean island basalts. A shallow-melting origin (~100 km), is compatible with the impact model. The subject of correlations between specific impact events, LIPs and mass extinctions has been reviewed by Alvarez (2003). Given the likely size ...
... (MORB), but with isotopic characteristics more like those of ocean island basalts. A shallow-melting origin (~100 km), is compatible with the impact model. The subject of correlations between specific impact events, LIPs and mass extinctions has been reviewed by Alvarez (2003). Given the likely size ...
Geo 221_14 copy
... forma8ons at many loca8ons. Many of the faunal successions from different con8nents displayed the same changes in fossil assemblages. By matching up faunal successions and using cross-‐cuBng rela8onships, ...
... forma8ons at many loca8ons. Many of the faunal successions from different con8nents displayed the same changes in fossil assemblages. By matching up faunal successions and using cross-‐cuBng rela8onships, ...
Geological Timescale Tables
... Deposition of Shawangunk Quartzite (rock climbing cliffs in New Paltz) Earliest fossil amphibians (i.e first animals on land!) Acadian Mountains (second period of high grade metamorphism in Central Parkformation of small granite bodies); deposition of sediments that form the Catskills Early trees, f ...
... Deposition of Shawangunk Quartzite (rock climbing cliffs in New Paltz) Earliest fossil amphibians (i.e first animals on land!) Acadian Mountains (second period of high grade metamorphism in Central Parkformation of small granite bodies); deposition of sediments that form the Catskills Early trees, f ...
Geologic Time: Group 1: You have been assigned the entire
... Deposition of Shawangunk Quartzite (rock climbing cliffs in New Paltz) Earliest fossil amphibians (i.e first animals on land!) Acadian Mountains (second period of high grade metamorphism in Central Parkformation of small granite bodies); deposition of sediments that form the Catskills Early trees, f ...
... Deposition of Shawangunk Quartzite (rock climbing cliffs in New Paltz) Earliest fossil amphibians (i.e first animals on land!) Acadian Mountains (second period of high grade metamorphism in Central Parkformation of small granite bodies); deposition of sediments that form the Catskills Early trees, f ...
Part 2 - Mahopac Voyagers!
... D) Early Proterozoic Era D) lived on land ____21. Which event occurred at the start of the Mesozoic Era? ____17. From the study of fossils, what can be inferred about most species of plants and animals that have lived on the Earth? ...
... D) Early Proterozoic Era D) lived on land ____21. Which event occurred at the start of the Mesozoic Era? ____17. From the study of fossils, what can be inferred about most species of plants and animals that have lived on the Earth? ...
NH_4e_CRS_Ch14
... All of these are characteristics If there are any survivors How large the volcanic eruption is How much the climate changes within a period Sudden loss of large numbers of plants and animals relative to the number of new species being added ...
... All of these are characteristics If there are any survivors How large the volcanic eruption is How much the climate changes within a period Sudden loss of large numbers of plants and animals relative to the number of new species being added ...
Extinction Event www.AssignmentPoint.com An extinction (level
... mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Other early physical evidence of a biogenic substance is graphite in 3.7 billion-year-old metasedimentary rocks discovered in Western Greenland. More than 99 percent of all species, amounting to over five billion s ...
... mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Other early physical evidence of a biogenic substance is graphite in 3.7 billion-year-old metasedimentary rocks discovered in Western Greenland. More than 99 percent of all species, amounting to over five billion s ...
On studying morphological features of impact craters using the
... that the Earth must be covered with the meteorite craters not less than the Moon or the Mars. The present view about the proposed number of large (D 100 km) ring structures (RS) on the Earth can be obtained from the cosmogeological maps [4, 5] (Figure 1a), which are comprised according to the data ...
... that the Earth must be covered with the meteorite craters not less than the Moon or the Mars. The present view about the proposed number of large (D 100 km) ring structures (RS) on the Earth can be obtained from the cosmogeological maps [4, 5] (Figure 1a), which are comprised according to the data ...
Cross section of the Earth
... layer of red-hot solid rocks; some of these rocks are so soft that they ooze about and can blast out of cracks in the crust, as lava. The layer under the mantle is called the Outer Core. It is made of liquid iron and nickel. Special movement in this section is responsible for the Earth’s magnetic ...
... layer of red-hot solid rocks; some of these rocks are so soft that they ooze about and can blast out of cracks in the crust, as lava. The layer under the mantle is called the Outer Core. It is made of liquid iron and nickel. Special movement in this section is responsible for the Earth’s magnetic ...
Chicxulub crater
The Chicxulub crater (/ˈtʃiːkʃʉluːb/; Mayan pronunciation: [tʃʼikʃuluɓ]) is an impact crater buried underneath the Yucatán Peninsula in Mexico. Its center is located near the town of Chicxulub, after which the crater is named. The age of the Chicxulub asteroid impact and the Cretaceous–Paleogene boundary (K–Pg boundary) coincide precisely. The crater is more than 180 kilometers (110 miles) in diameter and 20 km (12 mi) in depth, making the feature one of the largest confirmed impact structures on Earth; the impacting bolide that formed the crater was at least 10 km (6 mi) in diameter.The crater was discovered by Antonio Camargo and Glen Penfield, geophysicists who had been looking for petroleum in the Yucatán during the late 1970s. Penfield was initially unable to obtain evidence that the geological feature was a crater, and gave up his search. Through contact with Alan Hildebrand, Penfield obtained samples that suggested it was an impact feature. Evidence for the impact origin of the crater includes shocked quartz, a gravity anomaly, and tektites in surrounding areas.The age of the rocks marked by the impact shows that this impact structure dates from roughly 66 million years ago, the end of the Cretaceous period, and the start of the Paleogene period. It coincides with the K-Pg boundary, the geological boundary between the Cretaceous and Paleogene. The impact associated with the crater is thus implicated in the Cretaceous–Paleogene extinction event, including the worldwide extinction of non-avian dinosaurs. This conclusion has been the source of controversy. In March 2010, 41 experts from many countries reviewed the available evidence: 20 years' worth of data spanning a variety of fields. They concluded that the impact at Chicxulub triggered the mass extinctions at the K–Pg boundary. In 2013 a study compared isotopes in impact glass from the Chicxulub impact with the same isotopes in ash from the boundary where the extinction event occurred in the fossil record; the study concluded that the impact glasses were dated at 66.038±0.049 Ma, and the deposits immediately above the discontinuity in the geological and fossil record was dated to 66.019±0.021, the two dates being within 32,000 years of each other, or almost exactly the same within experimental error.