Earth Science 6th Grade Unit 2

What property is being measured when something is scratched?

• magnetism

• hardness

• cleavage

• luster

What property is being measured the a rock is struck by a hammer?

• hardness

• color

• streak

• cleavage

What is streak?

• the color trail left when a rock is scraped against an unglazed porcelain plate

• when the rock is scratched by different materials

• when a rock is hit with a hammer to see how it splits

• how a rock looks when exposed to light

What is a defining trait of all minerals?

• shiny

• made of carbon

• organic

• crystalline structure

Which is NOT a property of a mineral?

• relection

• color

• cleavage

• magnetism

What is the most abundant mineral in the Earth's crust and mantle?

• sulfates

• carbonates

• silicates

• oxalates

Which phrase describes the composition of the MOST abundant mineral compounds on Earth?

• oxygen, sulfates, and one or more nonmetals

• carbonates, oxygen, and one or more organic compounds

• silicon, oxygen, and one or more metals

• oxalates, oxygen, and one or more organic compounds

Minerals that are valued because they contain large amounts of a useful element are called _______?

• ore

• industrial mineral

• gem-bearing mineral

• silicate

What makes the ore bauxite special?

• It contains a usable amount of aluminum

• It is magnetic

• It is a gem-bearing mineral

• It has a low melting point

A geologist finds a large rock containing a seashell. what does this tell about the area at the time the rock was formed?

• The area was snowy.

• The area was hot and tropical.

• The area was dry and sandy.

• The area was covered by water.