Earth and Space Science
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7th Grade Science › Earth and Space Science
Select the outer most layer of the Earth.
Crust
Mantle
Outer Core
Inner Core
Explanation
The outer most layer of Earth is the Crust. The diagram provided illustrates the Earth's layers.
Select the main difference between the three types of rocks: sedimentary, metamorphic, and igneous.
How the rocks are formed
Where the rocks can be found
The age of the rocks
The texture of the rocks
Explanation
The main difference between the types of rocks is how the rocks are formed.
Sedimentary rocks are formed from small particles of materials, such as sand or pebbles.
Metamorphic rocks are formed from changes in heat and pressure under the earth's surface.
Igneous rocks are formed from magna cooling and hardening.
Select the theory that states that the Earth's outer shell is divided into several plates that glide over the mantle.
Plate Techtonics
Mantle Theorem
Layered Theorem
Outer Techtonics
Explanation
Plate Techtonics states that the Earth's outer shell is divided into several plates that glide over the mantle.
What type of rock could be made out of sand and shells?
Sedimentary
Metamorphic
Igneous
Igneous and Sedimentary
Explanation
Both sand and shells are small materials. A sedimentary rock is formed from small materials, such as sand and shells; thus, sedimentary is the correct answer.