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gr7Rocks
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Question | Answer |
---|---|
What is a rock | a mixture of two or more minerals |
What is a mineral | a pure, non-living, naturally occuring solid |
What are the three rock families | igneous, sedimentary and metamorphic |
What kind of rocks are igneous | fire rocks |
What kind of rocks are sedimentary | water rocks |
What kind of rocks are metamorphic | rocks that change form |
What family do granite and basalt belong to | igneous |
What family do limestone and sandstone belong to | sedimentary |
What family do slate and marble belong to | metamorphic |
Two types of melted rock | magma and lava |
Intrusive rock | igneous rock that forms from magma |
Extrusive rock | igneous rock that forms from lava |
Which (magma or lava) forms larger crystals and why | magma does because it takes longer to cool. |
Sediments | little pieces of rock like sand and gravel and mud |
Beds | layers of sediments |
Compaction and cementation | how sediments are turned into sedimentary rock |
Geologic Time Scale | the earth's history |
How may eras have occurred in the Earth's history | four eras |
Radioactive dating | a way scientists can tell the age of rock |
parent rock | the rock that a metamorphic rock comes from |
How old is the oldest rock? | 4.6 billion years |
How many eras is the geologic time scale broken into? | Four |
How many minerals are there in the world? | Over 3000 |
What are some properties that are used to tell minerals apart? | Hardness, luster, streak, colour |