Geologic Time

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Can you name the Chapter 4 Geologic Time Key Terms?

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DefinitionTerm
A solid copy of the shape of an organisms
Type of rock that fossils are usually found in
Fossils used to help geologists match rock layers
Type of fossil that provides evidence of the activities of ancient organisms
Many types of living things become extinct at the same time
The preserved remains or traces of living things
Animals with backbones
According to the law of superposition, the topmost rock layers are _____ than the layers below.
If an element does not change under normal conditions, it is said to be _____
Waste product of photosynthesis that helped to change Earth's atmosphere
Radioactive dating works well for this type of rock
Process in which unstable element sbreak down by releasing particles and energy
Long span of time that geologic time begins with
Animals without backbones
A hollow area in sediment in the shape of an organism
Geologists use the law of _____ to determine the relative ages of sedimentary rock layers.
The number of years since a rock has formed
An animal that lives part of its life on land and part of its life in water
Scientist who studies fossils
The preserved remains of organisms are sometimes found in this, which is the hardened sap of evergreen trees
A warm-blooded vertebrate that feeds its young milk
Lava that hardens on the surface
DefinitionTerm
The age of a rock compared to the ages of other rocks
All the information that paleontologists have gathered about past life
Process in which plants use energy from the sun to make their own food
A break in Earth's crust
Radioactive dating is used to determine the _____ age of rocks.
 
Fossils in which minerals replace all or part of an organism
When all the atoms in a particular type of matter are the same, the matter is a(n) _____
Faults are always _____ than the rock they cut through.
Three long units of time that geologic time is divided into
The time it takes for half of the radioactive atoms to decay
Tiny particles that make up all matter
Era that is often called the Age of Reptiles
Magma that cools and hardens into a mass of igneous rock below the surface
A type of fossil consisting of an extremely thin coating of carbon on rock
A record of the life forms and geologic events in Earth's history
Animal with scaly skin and lay eggs with tough, leathery shells
The gradual change in living things over long periods of time
Intrusions and extrusions are always _____ than the rock around them.
Era that is often called the Age of Mammals
The surface where new rock layers meet a much older rock surface beneath them
Units of geologic time that eras are divided into

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