6 IS 2.2

What are the three major groups of rocks classified by geologists?

• Igneous, sedimentary, and metamorphic

• Volcanic, oceanic, and continental

• Hard, soft, and medium

• Primary, secondary, and tertiary

How do sedimentary rocks form?

• From the cooling of magma

• From the accumulation and cementation of particles

• By heat and pressure

• From volcanic eruptions

Which rock type is formed by chemical reactions?

• Igneous

• Sedimentary

• Metamorphic

• Volcanic

What are the three main characteristics geologists observe to classify rocks?

• Color, size, and weight

• Mineral composition, color, and texture

• Shape, texture, and weight

• Color, hardness, and size

How does the silica content of basalt compare to granite?

• Higher silica content

• Lower silica content

What is the mineral composition in rocks used to determine?

• It determines the rock's age

• It helps identify the rock

• It makes the rock heavier

• It changes the rock's color

Which type of grain can only be seen with a microscope?

• Coarse grain

• Fine grain

• Medium grain

• Large grain

Which rock is an example of a coarse-grained rock?

• Slate

• Flint

• Diorite

• Breccia

What type of grain shape results from rounded bits of several rocks?

• Jagged grain

• Rounded grain

• Smooth grain

• Angular grain

What type of grain shape results from jagged bits of several rocks?

• Rounded grain

• Jagged grain

• Smooth grain

• Angular grain