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

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