– Circle the response that best answers the question.
... the mid-ocean ridge toward a trench. the core to the crust. a trench toward the mid-ocean ridge. 3. Geologists have learned about Earth's interior using evidence ...
... the mid-ocean ridge toward a trench. the core to the crust. a trench toward the mid-ocean ridge. 3. Geologists have learned about Earth's interior using evidence ...
Continental Drift
... subducting plate moves into the asthenosphere is heated and is incorporated into the mantle ...
... subducting plate moves into the asthenosphere is heated and is incorporated into the mantle ...
PDF format
... There are 55 questions (8 pages). For each question, select the correct answer and fill in your choice on the scantron form. 1. The average density of the Earth is 5.5 g/cm3 whereas the average density of surface rocks is 2.5-3.0 g/cm3. This tells us that: A. the Earth is comprised of many layers wi ...
... There are 55 questions (8 pages). For each question, select the correct answer and fill in your choice on the scantron form. 1. The average density of the Earth is 5.5 g/cm3 whereas the average density of surface rocks is 2.5-3.0 g/cm3. This tells us that: A. the Earth is comprised of many layers wi ...
Geol 101: Physical Geology Spring 2002
... A. they both show evidence of tropical climates in the south during the Carboniferous B. the shapes of their coastlines are very similar C. they have similar distributions of rocks that are about 550 million years old D. they both contain fossils of a type of plant species called Glossopteris E. the ...
... A. they both show evidence of tropical climates in the south during the Carboniferous B. the shapes of their coastlines are very similar C. they have similar distributions of rocks that are about 550 million years old D. they both contain fossils of a type of plant species called Glossopteris E. the ...
Plate Tectonics
... As new material oozes up, new lithosphere is formed. New material takes on the current orientation of the magnetic ...
... As new material oozes up, new lithosphere is formed. New material takes on the current orientation of the magnetic ...
Sea-Floor Spreading
... mantle and erupts. It then spreads out, pushing older rock to both sides of the ridge. ...
... mantle and erupts. It then spreads out, pushing older rock to both sides of the ridge. ...
Earth Geology/Tectonics
... – Big deal is that the conditions on earth were different back then, so we can’t understand those happenings using the same techniques we apply to today – Supported by church orthodoxy, very popular He remembers when rock was young. ...
... – Big deal is that the conditions on earth were different back then, so we can’t understand those happenings using the same techniques we apply to today – Supported by church orthodoxy, very popular He remembers when rock was young. ...
Ch.2 Tectonics
... There were objections to the continental drift hypothesis. There was a Lack of a mechanism for moving continents. Wegener incorrectly suggested that continents broke through the ocean crust, much like ic ...
... There were objections to the continental drift hypothesis. There was a Lack of a mechanism for moving continents. Wegener incorrectly suggested that continents broke through the ocean crust, much like ic ...
Plate Tectonics - Teacher Background File
... telephone and cable lines laid across oceans repeatedly snapped and had to be repaired it was suggested that this might be because they were being stretched. (This led to the “Expanding Earth” theory which as since been discounted). Exploration of the ocean floor since the early 1950s gave us images ...
... telephone and cable lines laid across oceans repeatedly snapped and had to be repaired it was suggested that this might be because they were being stretched. (This led to the “Expanding Earth” theory which as since been discounted). Exploration of the ocean floor since the early 1950s gave us images ...
Plate Tectonics and Layers of the Earth
... - Reversal has happened many times in past - Iron bearing minerals – magnetite, which is in basalt, record Earth’s magnetic field direction - Rocks show the effects of the reversal – new iron minerals are formed - Magnetometer records magnetic data - Magnetic alignment in the rocks reverses back and ...
... - Reversal has happened many times in past - Iron bearing minerals – magnetite, which is in basalt, record Earth’s magnetic field direction - Rocks show the effects of the reversal – new iron minerals are formed - Magnetometer records magnetic data - Magnetic alignment in the rocks reverses back and ...
Global Surveyor finds stripes on Mars
... A high-resolution map of remanent magnetism in the rocks of Mars, made by NASA’s Mars Global Surveyor, has found stripes of alternating magnetic polarity comparable to those found in the Earth’s ocean floors. The magnetic stripes on Earth formed when the ocean crust was formed, rolling out like a co ...
... A high-resolution map of remanent magnetism in the rocks of Mars, made by NASA’s Mars Global Surveyor, has found stripes of alternating magnetic polarity comparable to those found in the Earth’s ocean floors. The magnetic stripes on Earth formed when the ocean crust was formed, rolling out like a co ...
Plate Tectonics Section 1 Wegener`s Hypothesis continental drift
... • In the late 1950s, geologist Harry Hess proposed that the valley at the center of a mid-ocean ridge was a crack, or rift, in Earth’s crust. • As the ocean floor moves away from the ridge, molten rock, or magma, rises to fill the crack. • sea-floor spreading the process by which new oceanic lithosp ...
... • In the late 1950s, geologist Harry Hess proposed that the valley at the center of a mid-ocean ridge was a crack, or rift, in Earth’s crust. • As the ocean floor moves away from the ridge, molten rock, or magma, rises to fill the crack. • sea-floor spreading the process by which new oceanic lithosp ...
the sun part 2
... Spicules and coronal heating are due to magnetic field and happen all the time. Sunspots are also due to magnetic field but they form only when the Sun is (magnetically) “active”. In addition there are more processes on different scales that are due to the magnetic activity of the Sun. See next figu ...
... Spicules and coronal heating are due to magnetic field and happen all the time. Sunspots are also due to magnetic field but they form only when the Sun is (magnetically) “active”. In addition there are more processes on different scales that are due to the magnetic activity of the Sun. See next figu ...
Name
... erupts along the crest of the ridges to create new oceanic crust. This process, later called seafloor spreading, operating over many millions of years continues to form new ocean floor all across the 50,000 km-long system of mid-ocean ridges. This hypothesis was supported by several lines of evidenc ...
... erupts along the crest of the ridges to create new oceanic crust. This process, later called seafloor spreading, operating over many millions of years continues to form new ocean floor all across the 50,000 km-long system of mid-ocean ridges. This hypothesis was supported by several lines of evidenc ...
topic 4 – the moving crust
... is some evidence of sea floor spreading? P.388 - Sea-floor spreading is the process in which the ocean floor at the Mid-Atlantic ridge slowly increases in size over time due to new igneous rock being formed along a fault - Evidence: magnetic reversals, rock samples showing younger rock at the ridge ...
... is some evidence of sea floor spreading? P.388 - Sea-floor spreading is the process in which the ocean floor at the Mid-Atlantic ridge slowly increases in size over time due to new igneous rock being formed along a fault - Evidence: magnetic reversals, rock samples showing younger rock at the ridge ...
Plate Tectonics
... 3.) Why would you expect to see similar rocks and rock structures on two landmasses that were connected at one time? ...
... 3.) Why would you expect to see similar rocks and rock structures on two landmasses that were connected at one time? ...
planetesimals - Mestre a casa
... As planetesimals were running out, the impacts ceased and the early Earth began to cool slowly. First fragments of mainland were formed, and the crust, which at first was very thin, was gradually becoming thicker as material into Earth were getting cooler. In the atmosphere, large clouds began to fo ...
... As planetesimals were running out, the impacts ceased and the early Earth began to cool slowly. First fragments of mainland were formed, and the crust, which at first was very thin, was gradually becoming thicker as material into Earth were getting cooler. In the atmosphere, large clouds began to fo ...
Sea Floor Spreading The Mid-ocean Ridge
... formed at ocean ridges and destroyed at deep sea trenches – Magma forced toward crust – Fills gaps and hardens – Forms new ocean floor ...
... formed at ocean ridges and destroyed at deep sea trenches – Magma forced toward crust – Fills gaps and hardens – Forms new ocean floor ...
Evidence for Plate Tectonics
... which old ocean floor is pushed away from a mid-ocean ridge by the formation of new ocean floor • Trenches: V-shaped valley on the ocean floor where old ocean floor is subducted; a convergent plate boundary ...
... which old ocean floor is pushed away from a mid-ocean ridge by the formation of new ocean floor • Trenches: V-shaped valley on the ocean floor where old ocean floor is subducted; a convergent plate boundary ...
of the same age is form in southern Africa, South America, India, and
... within the continents that scientists began to recognize in the early-mid 1900s. Let’s look through some of those. Fit of the continents: In the 1960s, it was recognized that, especially if you take the continental slope into account, the continents fit together incredibly well. Just look at South A ...
... within the continents that scientists began to recognize in the early-mid 1900s. Let’s look through some of those. Fit of the continents: In the 1960s, it was recognized that, especially if you take the continental slope into account, the continents fit together incredibly well. Just look at South A ...
Unit VI: Circulation of the Solid Earth
... But there was no physical basis for drift, and his ideas were dismissed for half a century. In the early years after WWII, ocean exploration revealed mountain ranges in the middle of the oceans (mid-ocean ridges) and ships measured the orientation of magnetic minerals on the sea floor. They found ma ...
... But there was no physical basis for drift, and his ideas were dismissed for half a century. In the early years after WWII, ocean exploration revealed mountain ranges in the middle of the oceans (mid-ocean ridges) and ships measured the orientation of magnetic minerals on the sea floor. They found ma ...
Chapter 4
... • Throughout the earth’s history, the magnetic field has reversed itself many times. • Such reversals have come at irregular intervals, averaging about every 300,000 years; the last one was 780,000 years ago. Are ...
... • Throughout the earth’s history, the magnetic field has reversed itself many times. • Such reversals have come at irregular intervals, averaging about every 300,000 years; the last one was 780,000 years ago. Are ...
The Dynamic Earth – Plate Tectonics
... The Earth has a magnetic field This why a compass points to the north The simple presence of iron in the Earth’s core is not enough to account for the Earth’s magnetic field The high temperatures in the Earth’s core are far above the Curie temperature for any magnetic mineral ...
... The Earth has a magnetic field This why a compass points to the north The simple presence of iron in the Earth’s core is not enough to account for the Earth’s magnetic field The high temperatures in the Earth’s core are far above the Curie temperature for any magnetic mineral ...
Plate Tectonics Crossword - www .alexandria .k12 .mn .us
... (Hint: Starts with a “ T ”… See also #13 down clue) 2. Plate _____________. 4. ______________ zones. Places where the seafloor is forced under continental plates. 5. Section of the Earth below the crust. 7. Paleontologists noticed that these were the same on different continents even though the cont ...
... (Hint: Starts with a “ T ”… See also #13 down clue) 2. Plate _____________. 4. ______________ zones. Places where the seafloor is forced under continental plates. 5. Section of the Earth below the crust. 7. Paleontologists noticed that these were the same on different continents even though the cont ...
Slide 1
... It's made of solid rock and behaves like an extremely viscous liquid - (This is the tricky bit... the mantle is a solid which flows????) The convection of heat from the centre of the Earth is what ultimately drives the movement of the tectonic plates and cause mountains to rise. The outer core is th ...
... It's made of solid rock and behaves like an extremely viscous liquid - (This is the tricky bit... the mantle is a solid which flows????) The convection of heat from the centre of the Earth is what ultimately drives the movement of the tectonic plates and cause mountains to rise. The outer core is th ...
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.