Geologic Time

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Can you name the Chapter 4 Geologic Time Key Terms?

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

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