16 terms

Rocks and Minerals Grade 4

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rock
material made up of one or more minerals hardened
rock cycle
the never-ending processes that change rock from one type to another
igneous rock
a type of rock formed when melted rock cools and gardens
sedimentary rock
a type of rock formed by layers of sediment that press together over time
metamorphic rock
sedimentary or igneous rock that is put under great heat and/or pressure
magma
melted rock inside the earth
erosion
the movement of weathered sediment
weathering
the process of wind, water, ice, and plant roots breaking rocks into sediment
mineral
a natural material with a repeating crystal pattern
color
a way to help identify a mineral by looking at its outer hue
luster
the way a mineral reflects light
streak
the color a mineral leaves when it is rubbed on a hard white surface
hardness
a rock's ability to resist being scratched
Mohs hardness scale
a scale of ten minerals listed from softest to hardest
talc
the softest mineral listed on the Mohs hardness scale
diamond
the hardest mineral listed on the Mohs hardness scale
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