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Geology

Across
Has visible grains
Derived from plant material
0 degrees latitude
Hardness of 6 on Mohs scale
The movement of one tectonic plate beneath another
Important in petroleum formation
Boundary between Mantle and Crust
Main constituent of most rocks
Smallest component of an element
Substance that cannot be broken down into smaller substance by chemical means
The process of becoming different during growth and development
Determining the age of matter by comparing the relative proportions of isotopes
Large igneous intrusion
Rock native to an area
Type of Volcano
Contains iron and magnesium
A type of corundum
Hardness of 10 on the Moh's scale
Formed from remains of ancient marine life
Generally found in sedimentary rock
Distance from one crest of a wave to the next
Down
Hardness of 1 on Mohs scale
Type of organic rock
Has a chemical structure with a repeating pattern
Ancient supercontinent
Atom or molecule with a net electric charge
Each of two or more forms of the same element containing different numbers of neutrons
A type of quartz
Large volcanic crater
Amount of time it takes for half of a radioactive compound to degrade
Rock with glasslike texture
Rock texture resembling raisin bread
Longest day of the year
Turning into rock
Type of beryl with a hardness of about 8
Metamorphic rock derived from limestone
Slope movement
Piece of rock within igneous rock not derived from the original magma
Moving towards each other
Silicate material with sheetlike structure
Solidified from lava