Planet Earth

How Earth is studied, the rock cycle, changing landforms, and what the fossil record shows.

8 questions, free, marked as you go with a worked explanation on every one.

What this covers

• rocks and the rock cycle

The questions

1. Which type of rock forms when molten material cools and solidifies?
2. How does sedimentary rock usually form?
3. What does the rock cycle describe?
4. Which processes change landforms over time? Select all that apply.
5. A fossil of a marine shell is found high in a mountain range. What is the best explanation?
6. Why do scientists study rock layers when interpreting Earth's history?
7. GPS measurements show a tectonic plate creeping along at a steady 2.5 cm each year. Over 20 000 years, how far does the plate move, in metres?
8. In parts of the Alberta Rockies, thick layers of rock are bent into arches and troughs instead of being snapped apart. Geologists call these fold mountains. How did they form?

Answer these free