V. SUMMARY AND CONCLUSIONS 1. By what two properties are all rocks classified? 2
ID: 154282 • Letter: V
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V. SUMMARY AND CONCLUSIONS 1. By what two properties are all rocks classified? 2. Explain the difference between granite and rhyolite. In your explanation, include any differences and similarities in their textures, mineral compositions, and processes of formation In the lab, you learned how cooling rate affects the texture of igneous rocks. Describe a situation in which a porphyritic texture might develop in an igneous rock 3. 4. Rivers and stream systems tend to originate in mountainous areas, where they erode into the surrounding rock and transport large volumes of sediment. The velocity of water in rivers is influenced by a variety of factors, one of which is the volume of water being transported. The volume of water in a stream fluctuates depending upon the amount of precipitation, melt, and runoff it receives. Therefore, a stream's velocity (and, thus, capacity to carry large sediments) varies over time. Based on this information, along with your observations from lab, which sedimentary rock in your kit was likely formed in a fluvial (river or stream) environment? Classifying RocksExplanation / Answer
1
Two properties for classification of rocks-
1- Composition
2- Texture
2
Granite- Coarse grained, plutonic igneous rock formed within the earth from the crystallization of the magma having the minerals quartz, k-feldspar and mica.
Rhyolite- Fine grained, volcanic igneous rock formed on the earth's surface due to rapid cooling of lava having the same mineral composition as granite.
3
Porphyritic texture means that a large crystal is surrounded by smaller crystals. So here large crystals forms at some depth where the temperature is more and get time to grow a large crystal due to slow cooling and after some time magma comes to the surface and the residual magma crystallize very rapidly and formed very fine groundmass of smaller crystalls. This way porphyritic texture forms.
4
Sandstone in channel of river and shale on the floodplain.
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