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Rock that forms when layers of sediment and organic material harden is called ___.
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
a type of igneous rock
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
The thin outer layer of the earth is called the ___.
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
Most of earth's mass is in the ___.
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
A substance made of things that were never alive is called ___.
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
The color of the mark made when a mineral sample is rubbed on a harder surface is called the ___.
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
a rock-like substance that forms from decayed plant matter
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
Rock formed from magma or volcanic lava is called ___.
sedimentary
crust
igneous
streak
mantle
coal
inorganic
obsidian
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