ROCK STUDY GUIDE You will fill in your study guide as we go over in class today.

IGNEOUS

Igneous rocks are formed by cooling magma. The word igneous means “fire-made.”

METAMORPHIC ROCK

This rock is formed by limestone that has been exposed to heat and pressure.

Morph means to change form or shape.

SEDIMENTARY ROCK

This rock is formed underwater. It is made up of bits of shells and skeletons of sea animals.

It is also formed when tiny grains of sand are cemented together.

It is also formed when minerals dissolved in water crystallize.

GEOLOGIST

A person who studies the Earth and its features is called a geologist.

A geologist also studies the rocks and minerals of the Earth.

LUSTER

Luster is the way light is reflected off of an object.

WEATHERING

Weathering occurs when rocks are broken down into smaller pieces at the Earth’s surface.

EROSION

Erosion is when parts of the Earth’s surface are washed or carried away due to wind, water, or ice.

LAVA

Lava is the hot, molten, fluid material that erupts from the volcano or a volcanic vent.

MAGMA

Magma is the hot, molten material deep inside the Earth.

RELATIVE AGE

Relative age describes the age of something compared with the age of another thing.

Examples: younger, youngest, oldest, older

This woman is much older than this woman.

NAME SOME PRODUCTS WE USE EVERYDAY THAT COME FROM MINERALS

Talc- baby or talcum powder Fluorite- fluoride in your toothpaste Granite- kitchen counter tops Lithium- batteries Marble- building material for floors, pillars,

and bath tiles

THE ROCK CYCLE

The rock cycle is a never-ending process by which rocks are changed from one type into another.

STREAK

Streak tests are easy tests helpful in mineral identification.

The streak is simply the color of the powdered mineral.