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tetragonal; like cubic crystals; one of the principles dimensions is longer or shorter than the other two dimensions
the ratio of a minerals weight compared with the weight of an equal volume of water
Rocks are made up of many different minerals, rock fragments, volcanic glass, organic matter compared to a mineral which is not made of rock but made of natural processes
What is the difference between a rock and a mineral
they are formed in different areas Intr. below extru. above
what is the difference between extrusive and intrusive
rocks that have changed because of changes in temperature and pressure or the presence of hot, watery fluids
when mineral grains line up parallel layers metamorphic rock is considered to have this texture
when the sediments are pressed and cemented together by the wind blowing towards the rock and pressed together
the way sedimentary rocks are formed by sediments
Alfered Wegner purposed teh idea of continents that were together "continental drift"
what is the idea of continental drift
fossil clues (the Mesosaurus had been found in South America and Africa it is a fresh water animal and a land animal but it was on a land separated by salt water Wegener pruposed lived on both continents when they were joined)
1 evidence CD
widespread of plants (Glossopterous found in Africa, India, South America, and Antarctica since in so many regions Wegener which also helped him with the idea that every continent was together at once)
2 evidence CD
Climate clues (Wegener used continental drift to explain evidence of changing climates ex. fossils of warm weathered plants were found on the island of Spitsbergen in the Arctic ocean Wegener hypothesized that Spitsbergen drifted from tropical regions to the arctic ocean)
3 evidence CD
Rock clues (if teh continents were conected at one time, then rocks that make up the continents should be the same locations where they were joined similar rock structures are found on different continents)
4 evidence CD
its a big landmass of continents that Wegener proposed started out as all the continents today
the formation of Pangaea
Hess proposed that hot, less dense material below the Earth's crust rises toward the surface at the mid-ocean ridges
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