Rocks & Properties

4. many volcanic rocks have holes in them
5. is what color the mineral marks. The color of the streak is the color of the powder of the mineral and may differ from the minerals observable color.
6. some rocks have crystals and others do not. If they do have crystals
8. are the crystals uniform or different
10. that you can not see through the mineral at all.
14. sedimentary rocks have layers as do some metamorphic rocks
15. some rocks are dark, others are light
17. means that you can see through it slightly, but it is not clear.
19. rocks are formed deep within the Earth. They come up to the surface underground (in the form called magma) or break out of the ground (in the form called lava).
20. the processes associated with plate tectonics, these rocks are taken deep into the ground by subduction. Once deep underground, they are heated and remelted. They later cool and become metamorphic rocks.

1. properties: some rocks attract a magnet, others do not
2. some rocks contain sand or gravel particles
3. the Mohs hardness scale is used
7. means that you can see through the mineral pretty well.
9. is how the light interacts with the surface of the mineral..
11. rocks begin as either igneous rocks or sedimentary rocks.
12. some rocks reflect light like a mirror
13. are the crystals random or in layers
16. like rocks is used to describe how shiny the mineral is.
18. rocks are formed in layers as sediments, usually on the bottom of the ocean. Sometimes sedimentary rocks begin as layers of dirt or sand on the land. They get buried under thousands and thousands of feet of other rocks and turn to stone.