Geology

Geology

	Collecting Rocks The Earth is made of rock, from the tallest mountains to the floor of the deepest ocean. Thousands of different types of rocks and minerals have been found on Earth.
	Geologic Time The Earth is very old -- 4.5 billion years or more. This vast span of time, called geologic time by earth scientists, is difficult to comprehend in the familiar time units of months and years, or even centuries. This section discusses how scientists reckon geologic time, and why they believe the Earth is so old?
	Geologic Time Scale The study of the Earth from the beginning of time to the present can be broken down into sections called geological eras, periods, and epochs.
	Meteoroids and Meteorites The term meteor comes from the Greek meteoron, meaning phenomenon in the sky. It is used to describe the streak of light produced as matter in the solar system falls into Earth's atmosphere creating temporary incandescence resulting from atmospheric friction.
	Minerals and Their Uses Every segment of society uses minerals and mineral resources everyday. The roads we ride or drive on and the buildings we live learn and work in all contain minerals. This is a selected list of commonly used metallic and nonmetallic minerals, ore minerals, mineral byproducts, aggregates, and rock types that are used to make products we use in our daily life.
	Mohs Rock Hardness Scale One of the important identifying features of rock is its hardness.
	Geology Educational Activiteis Here are five geology activities for the classroom. SHAKE, RATTLE, AND Liquefy The Art and Science of Making Fossils Mudpile Mountain Do Rocks Last Forever? Everyone Needs a Rock