Name two different types of rocks.
Rocks are made up of layers of minerals. Minerals are made up of elements like oxygen, silicon, and iron. Rocks and minerals can tell us about the history of our planet.
Rocks and Minerals
Igneous Rock: Rocks that form from molten material called magma, which forms deep in the Earth's crust. Sedimentary Rock: Rocks that form when sediment is laid down and compressed over time, such as sandstone and limestone. Metamorphic Rock: Rocks that are formed when existing rocks are changed by intense heat and pressure deep in the Earth's crust, such as marble and quartzite.
Some rocks can float in water because they have a lower density than the water they are in. Some rocks can actually absorb water and swell up to several times their original size. Crocidolite, a type of mineral, is the toughest natural material known to man.
Did you know?
Work together in pairs: What are three physical properties that can be used to identify a rock or mineral?
What is the difference between a rock and a mineral?
Work together in pairs: What are the three main ways to identify a mineral?
Brain break: Draw a frog wearing a crown and holding a magic wand
What is the most common mineral in the Earth's crust?
Which type of rock is formed from cooled and solidified lava?
- Metamorphic rock
- Extrusive igneous rock
- Intrusive igneous rock
'Mohs Scale' is used to measure what property of a mineral?
What type of rocks are formed by sediment deposited over time and then compacted and cemented together?
- Metamorphic rocks
- Sedimentary rocks
- Igneous rocks
Which mineral is commonly used for making pencils?