8th Grade 1st Semester Final Study Guide

Front

What is an ore?

Back

An ore is a type of rock that contains sufficient minerals with important elements including metals that can be economically extracted from the rock.

Front

What happens to a mineral when it is no longer useful, profitable, or obtainable at a reasonable price?

Back

It is no longer classified as an ore.

Front

What does it indicate if the same sequence of rock layers is observed over a large area?

Back

It indicates that a large deposit of rock formed over a large area.

Front

What are minerals comprised of?

Back

Minerals are comprised of one or more elements.

Front

What type of rocks are formed when lava cools quickly?

Back

Extrusive igneous rocks are formed when lava cools quickly.

Front

Where are electrons located in an atom?

Back

Electrons are located outside of the nucleus.

Front

What charge do electrons have?

Back

Electrons have a negative charge.

Front

What is the difference between extrusive and intrusive igneous rocks?

Back

Extrusive igneous rocks form from lava that cools quickly on the Earth's surface, while intrusive igneous rocks form from magma that cools slowly beneath the surface.

Front

What is the definition of a mineral?

Back

A mineral is a naturally occurring, inorganic solid with a definite chemical composition and a crystalline structure.

Front

What is the rock cycle?

Back

The rock cycle is the continuous process by which rocks are created, changed, destroyed, and reformed over time.