Which of the following is not a type of rock?

Rocks are made up of:

Which type of rock is formed from cooled lava?

Which of the following is a sedimentary rock?

What type of rock is formed due to heat and pressure?

Which mineral is used to make pencils?

Marble is formed from which rock?

Which is the hardest natural substance on Earth?

Which of the following is an example of an igneous rock?

Which of these rocks may contain fossils?