| Question |
Answer |
| mineral |
natural, nonliving solid crystal that makes up rocks |
| luster |
the way a mineral's surface reflects light |
| Why is the streak test useful? |
Mineral colors vary, but a mineral's streak is always the same color |
| sedimentary rock |
rock that forms when sediments are cemented together and harden |
| How do freezing and thawing weaken rocks? |
Freezing and thawing water causes weathering by making the cracks larger. |
| igneous rock |
rock that forms from molten rock |
| What happens when igneous rocks cool very slowly? |
large crystals form - granite |
| What happens when igneous rocks cool very quickly? |
no time to form crystals - pumice, basalt, obsidian |
| sediment |
an earth material that has been moved from one place to another and layed down onthe surface of the earth |
| fossil |
remains or marks of a living thing from long ago |
| metamorphic rock |
rock that has changed as a result of heating and pressure |
| what happens when heat or pressure is applied to sedimentary or igneous rock |
it becomes metamorphic rock |
| weathering |
a gradual wearing away or changing of rock and soil caused by water, ice, temperature changes, wind, chemicals or living things. |
| erosion |
the movng of pieces of soil or rock by mechanisms including gravity, wind, water, ice or plants or animals. |
Biology Lab Midterm
