Earth's Materials

What material is soil mostly made of?

• nutrients
• bits of bone
• shells
• pieces of rock

Which type of soil does water quickly pass through?

• sand
• clay
• humus
• salt

What is true about silt?

• Silt has larger particles than sand and is sticky.
• Silt has smaller particles and holds water better than sand.
• Silt is made from humus and loam soil.
• Plants grow well in silt because it holds nutrients.

Which soil is formed from the smallest rock particles?

• loam
• sand
• silt
• clay

Rocks are made up of what?

• heat
• water
• soil
• minerals

What type of rock has changed over a long time because of heat and pressure?

• luster
• igneous
• metamorphic
• sedimentary

How are sedimentary rocks formed?

• pressure pushes these rocks out of the ground 
• lava flows out of volcanoes and cools
• small pieces of materials are pressed together for a long time
• magma hardens inside the Earth

Which type of rock is formed from melted magma, lava, and minerals?

• metamorphic
• igneous
• sedimentary
• mountains

What is a mineral?

• a decomposing organism found in nature
• a non-living solid found in nature
• a rock made from crystals and sunlight
• a solid made by humans

What does luster mean?

• the way a mineral changes color
•  a mineral that will scratch other minerals
•  the way a mineral pulls a magnet
• the way light bounces off a mineral