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Stack #2170972
| Question | Answer |
|---|---|
| early mapmakers thought continents might have moved based on their observation of | matching coastline |
| pangaea was an ancient supercontinent made of | all of the earths continent |
| to support his hypothesis, alfred wegner did not use | magnetic field data |
| fossil evidence that supported wegner`s continental drift included | land-dwelling animals |
| fossils of aquatic reptiles found in freshwater rocks suggested to wegner that these reptiles | probably didn't cross the ocean |
| based on observation of fossils of Glossopteris ,wegner concluded that | continental rock containing these fossils had once joined together |
| coal beds in Antarctica indicated to wegner that this continent was | once located closer to the equator |
| Based on the glacier deposits he observed, wegner argued that | landmasses drifted away from the south pole |
| most scientist at he time rejected wegner`s hypothesis of continental drift because he | couldn't explain how or why the continents moved |
| uses sound waves to measure water depth | sonar |
| maps made from sonar and magnetometer data led to the discovery of | ocean ridges and deep sea trenches |
| what are vast, underwater mountain chains | ocean ridges |
| rock samples taken near ocean ridges are what than rock samples taken near deep-sea trenches | younger |
| the thickness of ocean floor rock sediments what with distance from an ocean ridge | increases |
| the oldest ocean floor rocks are about | 120 million years old |
| the study of the magnetic records preserved in Earths rocks called | paleomagnetism |
| what is a change in earths magnetic fields | a magnetic reversal |
| earthquake activity and volcanism are common along | ocean ridges |
| the magnetic patterns on either side of a what are a mirror image of each other | an ocean ridge |
| the theory of what states that new ocean crust is formed at ocean ridges and destroying at deep-sea trenches | sea-floor spreading |
| as new seafloor is carried away from an ocean ridge, it what than the material beneath it | cools, contracts and becomes more dense |
| the theory of seafloor spreading explains that earths continents move because | they ride atop ocean crust as it moves away from the ocean ridges |
| earths what has changed over time | magnetic field |
| a field with the same orientation as todays field is said to have what? | normal polarity |
| a field that is opposite the present field has what | reverse polarity |
| magnetic data of the ocean floor has been used to generate what maps | isochron |
| isochron maps which have shown that the ocean floor is what near the ocean ridges and what near the deep sea trenches | younger, older |
| devices that can detect small changes in magnetic fields | magnetometer |
| minerals containing this act like small compass needles and records the orientation of earths magnetic field at the time of their formation | iron |
| was constructed from data gathered from continental basalt flows | geomagnetic time scale |
| this type of line connects points on a map that have the same age | the isochron |
| each cycle of spreading and magma intrusion along an ocean ridge results in the formation of this | new ocean crust |
| which theory states that the earths crust and ridged upper mantle move in different direction and add different rates over earths surface | plate tectonics |
| tectonic plates interact at places called plate | boundaries |
| where are most divergent boundaries found | on the seafloor |
| what happens along a divergent boundary | new ocean crust forms |
| the mid atlantic ridge is an example of a | divergent boundary |
| places where tectonic plates come together are called | convergent boundaries |
| convergent boundaries are classified according to the | type of crust involved |
| oceanic crust is made of mostly | basalt |
| which of the following features forms when 2 oceanic plates converge | subduction zone |
| what can happen when 2 oceanic plates converge and 1 is subducted into the mantle | melted magma erupts and forms an arc of islands |
| which of the following land forms result from divergent of continental crust | a rift valley |
| which of the following best describes what happens when an oceanic plate converges with a continental plate | a trench and a mountain range with many volcanos form |
| which feature is associate with a continental - continental plate boundary | a mountain range |
| at which tectonic boundary do plates side horizontally past each other | transform boundary |
| which of the following is not associated with transform boundaries | volcanos |
| explain the process of convection | transfer of thermal energy by the movement of heated matter. heated matter causes it to expand and decrease in density. this warm matter is forced upward as a result of buoyancy. the cooler part of the matter is pulled downward as a result of gravity |
| describe the formation of convection currents in the mantle | its a solid. the upper mantle can flow like a soft plastic. convection currents are set in motion by the transfer of energy between earths hot interior and cooler exterior. |
| how the part of convection current in the mantle are related to plate motions | the rising part of a convection current spreads out as it reaches the upper mantle and causes lateral and upward force |
| compare and contrast a ridge push and slab pull | both are processes associated with plate movement. ridge push is a process in which a uplift ridge is through to push the oceanic plate towards the sub zone. |
| slab pull | the weight of a subduction plate helps to pull the training lithosphere into the subduction zone |
Created by:
1rclaxton