Minerals that are rare and can be cut and polished, giving them a beautiful appearance.
What is a gem?
100
Minerals that split into pieces with smooth, regular planes that reflect light are said to have this.
What is cleavage?
100
When melted rock material cools on Earth's surface, this type of rock forms.
What is an extrusive rock?
100
Pieces of broken rock, shells, mineral grains and other materials make up the layers of this type of rock.
What is sedimentary rock?
100
This word means "change of form."
What is metamorphic rock?
200
Contains enough of a useful substance to be sold for a profit.
What is an an ore?
200
A scale used to rank the hardness of minerals.
What is the Mohs scale?
200
When melted rock material cools but never reaches the surface of Earth, this type of rock forms.
What is an intrusive igneous rock?
200
This type of sedimentary rock forms when seawater, loaded with dissolved minerals, evaporates.
What are chemical rocks?
200
The two main causes of how metamorphic rocks are formed.
What are high pressure and temperature?
300
Forms when melted rock material from inside Earth cools.
What is an igneous rock?
300
Used in making dry-wall.
What is gypsum?
300
One way that extrusive rocks can form.
1) Large cracks in Earth's surface, called fissures, open up. Then lava oozes out.
2) Volcanoes erupt and shoot out lava and ash.
300
When once living material piles up and is compressed over time.
What are organic rocks?
300
When a metamorphic rock is exposed to weathering and erosion, this type of rock is created.
What is a sedimentary rock?
400
New rocks that form when existing rocks are heated or squeezed but are not melted.
What are metamorphic rocks?
400
In 1996, the US produced 2,340,000 metric tons of refined copper. If the production increased 4.3% in one year, how many metric tons of refined were produced in 1997?
What is 2,440,000 metric tons?
400
The size of mineral crystals in igneous rocks helps do this.
What is classify the rocks?
400
Dinosaur bones and footprints are examples of this. These are often found in sedimentary rocks.
What are fossils?
400
When heat and pressure is applied to an igneous rock over a long period of time, this type of rock forms.
What is a metamorphic rock?
500
A model used to describe how different kinds of rocks are related to each other and how one rock changes from one type into another.
What is the rock cycle?
500
Which properties are NOT commonly used to identify minerals?
A) reaction to acid
B) cleavage and fracture
C) specific gravity
D) mass and size
What is specific gravity?
500
A rock is said to have this characteristic if you can see different layers of minerals inside the rock.
What is foliated?
500
The surrounding sedimentary rock insulates the cooling magma.
Why do igneous rocks cool slowly?
500
When heat and pressure is applied to a sedimentary rock, it forms this substance.