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He 2
fossils that are used to define and identify geologic time periods
a fossil in which minerals replace all or part of an organism
formed when an object is placed into soft mud and is removed by decomposition or physical sources
The movement of deep, cold, and nutrient-rich water to the surface
a plant , animal or other organism is perfectly preserved for many of years
Microscopic organisms that float and drift in the ocean waters are called
A fossil formed when most of the materials making up an organism break down, leaving only carbon
rock that forms when melted rock cools and hardens
The breaking down of rocks and other materials on the Earth's surface.
A thin layer of gases surrounding Earth
a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
Preserved remains of once-living organisms
A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions.
photosynthetic algae found near the surface of the ocean
Be 4
Li 3
Molten rock beneath the earth's surface