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Unit 3 rocks
| Question | Answer |
|---|---|
| What forms igneous rock | Magma cooling and solidifying |
| What does porphyritic mean | A rock with both large and small |
| What does vesicular mean | A rock that has holes from bubbles |
| What does “felsic” mean and what color are felsic rocks? | Answer: High in silica; light-colored. |
| What does “mafic” mean and what color are mafic rocks? | High in magnesium and iron; dark-colored. |
| What is the difference between intrusive and extrusive rocks? | Intrusive cool slowly inside Earth (large crystals); extrusive cool quickly on the surface (small/no crystals). |
| Name one intrusive rock and one extrusive rock. | Intrusive: Granite; Extrusive: Basalt or Pumice. |
| What color and texture is granite? | Pink, gray, black, or white with large crystals. |
| What is obsidian and what does it look like? | Dark volcanic glass; shiny and smooth. |
| Why does pumice float? | It contains many vesicles (air-filled holes). |
| What are sedimentary rocks made from? | Sediment that gets deposited. |
| What is compaction? | Sediment being pressed together by weight. |
| What is cementation? | Minerals gluing sediment grains together. |
| What are chemical sedimentary rocks and give one example? | Rocks formed from minerals precipitating out of a solution; example: halite or gypsum. |
| What are organic sedimentary rocks and give one example? | Rocks formed from remains of plants/animals; example: coal or limestone. |
| What are clastic sedimentary rocks and give one example? | Rocks made from pieces of other rocks; example: sandstone, shale, or conglomerate. |
| What do sorting and angularity describe? | Sorting describes grain-size similarity; angularity describes whether grains are sharp or rounded. |
| What is limestone and what feature does it often contain? | Organic sedimentary rock; often contains fossils. |
| What is shale made of and how does it break? | Made of silt and clay; breaks into thin pieces. |
| What makes conglomerate different from sandstone? | Conglomerate has rounded pebbles; sandstone is made of sand grains. |
| What is contact metamorphism? | Rock changes due to heat from touching magma. |
| What is regional metamorphism? | Rock changes over a large area due to heat and pressure. |
| What does foliated mean? | Minerals arranged in layers or bands. |
| What does non-foliated mean? | No layering; minerals are randomly arranged. |
| Give one foliated rock and one non-foliated rock. | Foliated: Slate, Schist, or Gneiss; Non-foliated: Marble. |
Created by:
Elise43
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