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Age of Earth Part 2

Horizontales
The time it takes for 50% of the radioactive material to decay
The geologic era in which we live
A series of processes on and beneath earths surface that change rocks from one kind to another.
The age of a rock since it was formed
A rock type that is formed by deposits of sediment pressed together
A geological law that states in horizontal sedimentary layers the oldest layer is on the bottom
A break in the earths crust
The longest era in the geologic time scale
The "middle" era, in which Pangaea formed.
Plants or animals trapped in layers of sedimentary rock
Magma that forces itself into older rocks
A type of rock formed from heat, pressure or chemical reactions
Verticales
The study of earth and the forces that change it
A super continent that drifted apart during the mesozoic era
A type of rock formed when molten material from beneath the earths surface cools and hardens
One of 4 time divisions in the geologic time scale.
The age of a rock based on the rocks nearby
When a newer rock layer meets a much older layer.
Lava that cools and hardens on surface
The era that includes life of reptiles