Science / Geologic Time

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Can you name the Chapter 4 Geologic Time Key Terms?

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

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