vocabulary 1
a solid, nonliving substance found in the earth that makes up rocks
mineral
a dark rock or natural glass formed from lava that cooled very quickly
obsidian
Sandstone is a type of igneous rock.
If the answer is false, write the correct answer.
False, sandstone is a type of sedimentary rock.
Obsidian has very fine (small) minerals because it cools very ____________.
slowly or quickly
quickly
What is the first step of sedimentary rock forming? Give one example of it.
weathering
snow, rain, etc.
the size, shape, and sorting of the mineral grains in rocks
texture
mixed with liquid so no solid pieces are visible anymore
True
Granite has large minerals because it cools very __________ .
slowly or quickly
slowly
What is second step of sedimentary rock forming? Describe it.
deposition
to closely pack or press together
compact
the process or force that moves sediments to new locations
erosion
Obsidian is a type of sedimentary rock.
False, it is a type of igneous rock.
Igneous rocks are formed when _________ cools from volcanic eruptions.
lava
___________ is when sediments move to new locations.
Erosion
able to last a long time in good condition
durable
a type of layered rock made up of sediments and sand
sedimentary rock
There are 7 stages for sedimentary rock to form.
Name two types of igneous rocks.
obsidian
granite
basalt
_____________ is when layers of sediment are pressed together.
Compaction
a common igneous rock that forms from magma that cooled within Earth's crust
granite
a type of rock that forms when either igneous rock or sedimentary rock is changed due to extreme heat or pressure
metamorphic rock
All rocks have the same sized minerals.
False, some rocks have bigger or smaller minerals.
True or False
Lava that cools faster will have smaller grains than lava that cools more slowly.
True
What is the final step of sedimentary rock formation called? What acts as a glue to finalize the rock?
cementation
minerals from water