18. Which of the layers of the Earth is also called a \"tectonic plate\"? a. cru

Question

18. Which of the layers of the Earth is also called a "tectonic plate"? a. crust b. lithosphere c. mantle d. core 19. Which of these letters indicates where the youngest seafloor is found? a. A b. B c. C 20. This map shows the position of the Earths continents and oceans today The grey areas represent land, and the white represents water. Which of the following best explains why the ocean basins look the way they do? a. Meteor impacts caused the ocean basins to form this way b. Ocean basins form as continents move c. Ocean basins formed in cracks as Earth cooled 21. Why are the oldest rocks on the continents rather than on the seafloor? a. Rocks on the seafloor are too wet to last very long b. Oceanic crust is destroyed at convergent boundaries while continental crust is not c. Dating seafloor rocks is very imprecise, so this relationship may not be true 22. The oldest rocks in the Atlantic Ocean are 180 million years old. Imagine you are a writing a scientific proposal to explore the ocean floor for an A ancient marine animal that lived from 70 million years ago to 110 million years ago. At which location would you propose to start your research? a. A b. B B C D d. D 23. The age and thickness of sediment on the ocean floor a. increases as you move away from a divergent boundary b. decreases as you move away from a divergent boundary c. is uniform across the whole ocean floor 24. On the map to the right, where is the youngest ocean crust? continent al crust b. B c. C d. D oceanic crust 25. On the map to the right, where is oceanic ridge the oldest ocean crust? -oceanic trench a. A b. B c. C d. D ! volcano

Explanation / Answer

18. Tectonic plates is composed of the uppermost brittle layer of earth also known as lithosphere and hence “b” is correct answer

19. The mid oceanic ridge is the place where new magma comes to the surface and hence B is the place where youngest sea floor is found and hence “b” is correct answer.

20. As the continents plates moves apart then we have formation of new oceanic crust and thus the formation of oceans takes place and hence “b” is correct answer.

21. The subduction of oceanic plate takes plate in the convergent and due to high heat present at these subduction zones we don’t have oceanic crust that old as compared to continental crust and hence “b” is correct answer.

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