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Earth Science 15

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Across
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The geologic ___ is a sequence of rock units and layers
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Creationists believe this caused many fossils
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Era the Jurassic period is in
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Rocks from volcanic activity
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Rock that comes from magma hardens after squeezing into other rocks
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Hardest type of coal
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Fossils that are used to estimate the age of rock strata
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Lake with vertical logs buried in mud
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When a species disappears
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Nonfoliated rock used in monuments
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Coarsest grade of clastic sedimentary rock
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Rock that is a blend of sedimentary and igneous
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Fossils that go through several layers of rock
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Rock with interconnected pores
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Sedimentary rock that comes from chemicals dissolved in water
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Material in which something is enclosed of embedded
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Period within the Cenozoic era
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Most common intrusive igneous rock
Down
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Volcanic "glass"
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Any trace or remains of a living organism
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Igneous rock that often is so light it floats
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Rock that results from lava hardening above the earth's surface
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Study of rocks
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Rock that has been thick solids in water, then compacted with great pressure
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Rock with no interconnected pores
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Solid fossil fuel
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Giant reptile-like animals from the past
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95% of fossils are of ) _____ origin
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Liquid fossil fuel
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Solid material in the earth's crust
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Most natural gas is this
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Fossil that may or may not be human (p 392)
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These were formed when slate was deeply buried and then exposed to great pressure and temperature