1 Give one piece of evidence that supports the moderm theory of plate 2. The ste
ID: 288157 • Letter: 1
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1 Give one piece of evidence that supports the moderm theory of plate 2. The steep-walled valley on the sea floor which occurs parallel to and in 3. In general, 4. List three pieces of evidence that Alfred Wegener used in the carly 1900's 5. moved throughout the history of the Earth. tectonics (not the evidence that Wegener used for continental drift). conjunction with a convergent plate boundary is called a when identifying an unknown mineral. in his theory, which attempted to prove that continents have is the most unreliable physical property to use 7. 8. What is the main factor, which controls the texture of an igneous rock? 9. What is the most abundant element in the crust of the Earth? 10. What is the second most abundant element in the crust? 11. Decompression melting would most likely occur at a is an intermediate. plutonic igneous rock plate boundary 12. List one other common element found in the crust of the Earth that occurs 13. What is the composition of ocean crust (what rock name)? 14. What type of lava or magma (composition) is associated with volcanoes 15. When subduction of plates occurs, which type of plate (continental or 16 Name a mountain range in Europe, which has resulted from a continent- 7 What type of chemical bonding involves the sharing of electrons between 3 Which physical property of a mineral is determined by rubbing the mineral in rock forming minerals. at subduction zones? oceanic) is always the plate, which is subducted? to-continent collision neighboring atoms? on piece of glazed, white porcelain? Based on the average geothermal gradient in the lithosphere, what would be the approximate temperature at a depth of 20 kilometers? Give geographic example of a modern volcanic island arc. are the most important group of minerals Why is the group in # 21 above so important? leneous rocks that contain minerals rich in iron and magnesium are spically darker or lighter in color? minerals in # 23 above? Ahat is the principal difference between lava and magma? . What is the name of the chemical group of igneous rocks that contain theExplanation / Answer
1. one piece of evidence that led to the modern they of plate tectonics is presence of Stripes of magnetic material in the seafloor. The stripes alternate between those with magnetic material orientated toward magnetic north, and those oriented in the opposite direction. Seafloor spreading is the mechanism behind this phenomenon
2. oceanic trench- These are topographic depressions of the sea floor, relatively narrow in width, but very long.
3. In general color is the most unreliable physical property to use when identifying an unknown mineral. A number of different minerals have the same color. A mineral may come in a variety of colors or may even change color due to the environment.
4. The three pieces of evidence that alfred wegner used are
a. outlines of many coastlines (like South America and Africa) look like they fit together like a puzzle.
b. presence of fossil relevance. There are various examples of fossils found on separate continents and in no other regions. This indicates that these continents had to be once joined together because the extensive oceans between these land masses act as a type of barrier for fossil transfer.
c. The Mesosaurus is known to have been a type of reptile, similar to the modern crocodile, which propelled itself through water with its long hind legs and limber tail. It lived during the early Permian period (286 to 258 million years ago) and its remains are found solely in South Africa and Eastern South America. Now if the continents were in still their present positions, there is no possibility that the Mesosaurus would have the capability to swim across such a large body of ocean as the Atlantic because it was a coastal animal.
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