Chapter 17 Notes Know the definition of each of these vocabulary
... There are three types of stress, compression, tension, and shear. Compression is when an item is pushed together making the volume decrease. A compression earthquake would be a reverse fault. Tension is when an item is pulled apart making the volume increase. A tension earthquake would be a normal f ...
... There are three types of stress, compression, tension, and shear. Compression is when an item is pushed together making the volume decrease. A compression earthquake would be a reverse fault. Tension is when an item is pulled apart making the volume increase. A tension earthquake would be a normal f ...
Restless Continents
... 4. When oceanic lithosphere forms, magnetic minerals in the magma align with Earth’s magnetic field. They are frozen in place when the magma cools and hardens. As sea-floor spreading continues, that part of the lithosphere moves away from the ridge. If Earth’s magnetic field reverses, then minerals ...
... 4. When oceanic lithosphere forms, magnetic minerals in the magma align with Earth’s magnetic field. They are frozen in place when the magma cools and hardens. As sea-floor spreading continues, that part of the lithosphere moves away from the ridge. If Earth’s magnetic field reverses, then minerals ...
Plate Boundaries - Valhalla High School
... Theory of Continental Drift? • Alfred Wegner, 1915 • The continents were once a super-continent called Pangea • the continents are plowing through the ocean floors---most people didn’t believe this ...
... Theory of Continental Drift? • Alfred Wegner, 1915 • The continents were once a super-continent called Pangea • the continents are plowing through the ocean floors---most people didn’t believe this ...
Plate Tectonics notes
... Above: Supercomputer models of Earth's magnetic field. On the left is a normal dipolar magnetic field, typical of the long years between polarity reversals. On the right is the sort of complicated magnetic field Earth has during the upheaval of a reversal ...
... Above: Supercomputer models of Earth's magnetic field. On the left is a normal dipolar magnetic field, typical of the long years between polarity reversals. On the right is the sort of complicated magnetic field Earth has during the upheaval of a reversal ...
Name
... is older than the layer above it and younger than the layer below it. 4. The fossils of organisms that were widely distributed but only lived during a short period of time are called index fossils. 5. Index fossils useful to geologists because they tell the relative age of the rock in which they occ ...
... is older than the layer above it and younger than the layer below it. 4. The fossils of organisms that were widely distributed but only lived during a short period of time are called index fossils. 5. Index fossils useful to geologists because they tell the relative age of the rock in which they occ ...
Earth`s Interior and Geophysical Properties
... - averages 70 km beneath oceans, may be 125-150 km beneath continents - seismic waves v generally increases with depth - low velocity zone ---> marks boundary of Asthenosphere b. Asthenosphere - low velocity zone (geophysical term) - rocks are close to melting point - which is controlled by T and P ...
... - averages 70 km beneath oceans, may be 125-150 km beneath continents - seismic waves v generally increases with depth - low velocity zone ---> marks boundary of Asthenosphere b. Asthenosphere - low velocity zone (geophysical term) - rocks are close to melting point - which is controlled by T and P ...
Chapter_1_Section1
... Rock – the material that forms Earth’s hard surface Geologists study: the processes that create Earth’s features search for clues about Earth’s history study the chemical and physical properties of rock map where different types of rock are found ...
... Rock – the material that forms Earth’s hard surface Geologists study: the processes that create Earth’s features search for clues about Earth’s history study the chemical and physical properties of rock map where different types of rock are found ...
A historical overview of the work of Wegener
... In his spare time, follows an interest in the possibility that America and Africa had once been joined, and had subsequently drifted apart. (This is not a new idea; Flemish mapmaker Ortelius (in 1596) and English philosopher Frances Bacon (in 1620) recognised that the continents might have at one ti ...
... In his spare time, follows an interest in the possibility that America and Africa had once been joined, and had subsequently drifted apart. (This is not a new idea; Flemish mapmaker Ortelius (in 1596) and English philosopher Frances Bacon (in 1620) recognised that the continents might have at one ti ...
Mid-Oceanic ridge system
... created on the ocean floor, the new crust solidifies, with its iron oxide acting like miniature compass needles. The magnetic bands have been matched on either side of the mid-oceanic ridge out to the edges of the ocean to determine the distance between continents on either side of the ridge. Magnet ...
... created on the ocean floor, the new crust solidifies, with its iron oxide acting like miniature compass needles. The magnetic bands have been matched on either side of the mid-oceanic ridge out to the edges of the ocean to determine the distance between continents on either side of the ridge. Magnet ...
PS 2-6-08 - elyceum-beta
... orientation as the ship moves away from ridge • Evidence that the orientation reverses every 200,000 to several million years • Matched bands with the same magnetic orientation are found on both sides of a ridge ...
... orientation as the ship moves away from ridge • Evidence that the orientation reverses every 200,000 to several million years • Matched bands with the same magnetic orientation are found on both sides of a ridge ...
unit 2 earth history - possible test questions
... The temperature at which magnetite can gain or loses it remnant magnetism from heating? ____ D. (Page 38) As a group, how many geologists accept that plates are created at oceanic ridges and destroyed at deep sea trenches? ______ E. (Page 39) The lithosphere overlies the hotter and weaker semi-plast ...
... The temperature at which magnetite can gain or loses it remnant magnetism from heating? ____ D. (Page 38) As a group, how many geologists accept that plates are created at oceanic ridges and destroyed at deep sea trenches? ______ E. (Page 39) The lithosphere overlies the hotter and weaker semi-plast ...
Continental Drift
... At various times in the past, Earth’s magnetic field has completely reversed, magnetic south near the north geographic pole magnetic north near the south geographic pole ...
... At various times in the past, Earth’s magnetic field has completely reversed, magnetic south near the north geographic pole magnetic north near the south geographic pole ...
Unit 4 Chapter 10
... Sea-Floor Spreading In the late 1950’s geologist Harry Hess came up with a new hypothesis. He proposed that the center valley was actually a ridge where molten rock would come to the surface and fill the cracks and push the land away. Robert Dietz renamed the process as “Sea Floor Spreading”. Hess’ ...
... Sea-Floor Spreading In the late 1950’s geologist Harry Hess came up with a new hypothesis. He proposed that the center valley was actually a ridge where molten rock would come to the surface and fill the cracks and push the land away. Robert Dietz renamed the process as “Sea Floor Spreading”. Hess’ ...
Chapter 5 Notes: Plate Tectonics Earth’s Interior Direct
... These rocks only form when molten material cools quickly o Magnetic strips The earth’s magnetic poles have reversed many times Evidence in the rocks on the ocean floor o Drilling Samples The samples far from the ridge are older The “youngest” rocks near the center of the ridge ...
... These rocks only form when molten material cools quickly o Magnetic strips The earth’s magnetic poles have reversed many times Evidence in the rocks on the ocean floor o Drilling Samples The samples far from the ridge are older The “youngest” rocks near the center of the ridge ...
Faith and Science: The Age of the Earth from
... ridge crests. Oceanic basalts only get to be a few hundred million years old, whereas continental rocks can be billions of years old. ...
... ridge crests. Oceanic basalts only get to be a few hundred million years old, whereas continental rocks can be billions of years old. ...
Tectonic Plates
... Basic Premise of Plate Tectonics • Earth’s crust is divided into plates • Plates move relative to one another (at 1-15 cm/yr) • Deformation is concentrated at plate boundaries • There are 3 types of tectonic boundaries ...
... Basic Premise of Plate Tectonics • Earth’s crust is divided into plates • Plates move relative to one another (at 1-15 cm/yr) • Deformation is concentrated at plate boundaries • There are 3 types of tectonic boundaries ...
Chapter 3 Plate Tectonics
... • The pattern of magnetic stripes is identical on both sides of a mid-ocean ridge. • As magma hardens into rock at a midocean ridge half the rock moves in one direction and the other half moves in the opposite direction. • The oldest rocks on land are 4 billion years old but the oldest rocks in th ...
... • The pattern of magnetic stripes is identical on both sides of a mid-ocean ridge. • As magma hardens into rock at a midocean ridge half the rock moves in one direction and the other half moves in the opposite direction. • The oldest rocks on land are 4 billion years old but the oldest rocks in th ...
Introduction to Earthquakes EASA
... Wegener died in 1930 with his hypothesis largely ignored. But despite the problems and an overwhelming rejection of his ideas, not everyone forgot about his work. In the 1940’s and 1950’s geophysicists studying the record of Earth’s magnetic field began to revive some of the ideas to explain observe ...
... Wegener died in 1930 with his hypothesis largely ignored. But despite the problems and an overwhelming rejection of his ideas, not everyone forgot about his work. In the 1940’s and 1950’s geophysicists studying the record of Earth’s magnetic field began to revive some of the ideas to explain observe ...
Earth Science - Faustina Academy
... record Earth's magnetic field direction when they form Using a magnetometer to detect magnetic fields, scientists have mapped regions of alternating magnetic direction parallel to the mid-ocean ridges Magnetic reversals show that new rock is being formed Quick Question How could seafloor spreadi ...
... record Earth's magnetic field direction when they form Using a magnetometer to detect magnetic fields, scientists have mapped regions of alternating magnetic direction parallel to the mid-ocean ridges Magnetic reversals show that new rock is being formed Quick Question How could seafloor spreadi ...
Earth Science Vocabulary Chapter 9: Plate Tectonics Section 9.1
... Divergent Boundary- a region where the rigid plates are moving apart, typified by the oceanic ridges Convergent Boundary- a boundary in which two plates move together Transform Fault Boundary- a boundary in which two plates slide past eachother without creating or destroying lithosphere Section 9.3: ...
... Divergent Boundary- a region where the rigid plates are moving apart, typified by the oceanic ridges Convergent Boundary- a boundary in which two plates move together Transform Fault Boundary- a boundary in which two plates slide past eachother without creating or destroying lithosphere Section 9.3: ...
Earth`s Interior
... Planet Earth is a rocky planet. It is made up of rocks and minerals. This sphere is called the “geosphere”. The Earth is made up of a number of elements. The interior of the Earth is quite different than the exterior (continental crust). ...
... Planet Earth is a rocky planet. It is made up of rocks and minerals. This sphere is called the “geosphere”. The Earth is made up of a number of elements. The interior of the Earth is quite different than the exterior (continental crust). ...
Layers.of.Earth.part.2
... Lithospheric plates are large segments of the lithosphere that consist of oceanic and/or continental crust Seven major and many minor plates (has changed throughout Earth’s history) ...
... Lithospheric plates are large segments of the lithosphere that consist of oceanic and/or continental crust Seven major and many minor plates (has changed throughout Earth’s history) ...
Chapter 9 Plate Tectonics
... accurately showed the shapes of the continents. Once people had these accurate maps, they began to notice that some continents fit together like pieces of a puzzle In 1915, Alfred Wegener proposed the hypothesis of continental drift Continental Drift all the continents had at one time been j ...
... accurately showed the shapes of the continents. Once people had these accurate maps, they began to notice that some continents fit together like pieces of a puzzle In 1915, Alfred Wegener proposed the hypothesis of continental drift Continental Drift all the continents had at one time been j ...
Geomagnetic reversal
A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged. The Earth's field has alternated between periods of normal polarity, in which the direction of the field was the same as the present direction, and reverse polarity, in which the field was the opposite. These periods are called chrons. The time spans of chrons are randomly distributed with most being between 0.1 and 1 million years with an average of 450,000 years. Most reversals are estimated to take between 1,000 and 10,000 years.The latest one, the Brunhes–Matuyama reversal, occurred 780,000 years ago;and may have happened very quickly, within a human lifetime. A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period. That reversal lasted only about 440 years with the actual change of polarity lasting around 250 years. During this change the strength of the magnetic field dropped to 5% of its present strength. Brief disruptions that do not result in reversal are called geomagnetic excursions.