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Geology - Earth scienceMore knowledge = better decisions
Why do mountains exist?|
Why do we have volcanoes?
Why are volcanoes not everywhere?
Why do we have earth quakes?
The name for the science of Geology comes from the
Greek language: γη, gê, "Earth"
and λόγος, logos, "speech"
So Geology is "talking about Earth"
A nice definition of Geology is:
Geology is a science that deals with the history of the Earth as recorded in rocks
Geological forces have determined the look of our Earth
Pangaea - there was a time when continents were together|
~270 million years ago
There was a time when continents were together.
When bumping into each other, mountain ranges were pushed up and folded.
Earth's surface consists of many continental and oceanic plates moving all the time causing earthquakes
The area of today's southern United States had two huge mountain ranges, the Ouachita Mountains and the Appalachian mountains.
They were pushed up by the African plate pushing against the North American plate.
Florida was once part of Africa.
During the Triassic Period about 240 million years ago, the continental plates of North and South America and Africa were together and started drifting apart.
The Andes mountain range is the longest mountain range on Earth
The name Cretaceous period comes from the Latin language for "chalky"
and is usually abbreviated K for its German translation Kreide = chalk.
At the beginning of the Cretaceous period, about 145 million years ago, Earth looked very different!
Many areas today dry land, were covered by the sea.
Multitudes of sea life deposited calcium carbonate sediment
- the origin of limestone or "lime" shells and skeletons.
Fossil found at BSB
Stone is hard and water is soft, but water is powerful and persistent and wears away stone.
Water penetrates pores and cracks - when it freezes it expands, sometimes breaking the stones.
Rainwater picks up carbon dioxide from the air and soil and forms a dilute solution of carbonic acid,
which can easily dissolve limestone.
Caverns, sinkholes, and fantastically shaped pieces of limestone result.
Movements of the tectonic plates cause earthquakes
Many earthquakes are happening every day!!
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Fossil seen in limestone wall at a road cut
in the southern Texas Hill Country
Understand Earth - update your geology knowledge|
Continental plates change Earth's surface
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