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6thscience chapter 2
science for sixth graders
Question | Answer |
---|---|
What is the softest mineral? | Talc |
What is the Hardest mineral that can scratch a steel file? | Diamond |
How many known minerals are there? | 4000 |
Can minerals be man-made? | no |
Can minerals be made from once living things? | No |
What are the three main types of rocks? | Igneous, Sedimentary, and Metamorphic |
What gives a rock it's texture? | Grains |
What three characteristics do geologists use to determine the rock? | Color, Texture, and Mineral Composition |
How do igneous rocks form? | When molten material cools and hardens |
If a mineral has high silica content, what color is it? | The color would be light |
What is the difference between extrusive and intrusive rock? | Extrusive Rock- rock formed from lava that flowed out of a vent onto Earth's surface Intrusive Rock- rock formed from magma that hardened within Earth's interior |
Two ways minerals form | When molten rock cools and when water that has atoms dissolve elements in it, evaporate away. Solids are left behind and crystalize. |
how does igneous rock form? | Forms when magma cools |
how does sedimentary rock form? | When particles of rocks, plants, and animals are cemented together |
How does metamorphic rock form? | |
What are five characteristics to tell if a rock is a mineral? | Naturally Solid Crystal Structure unique composition and inorganic (cant be made from something once living |
If you can see the grains easily on a rock, what type of grains does it have? | Coarse |
If you cannot see the grains easily on a rock, what type of grains does it have? | Fine |