1. 21 st Century Science P1 Revision Quick Quiz 2010-11 Specification

2. 1. This diagram shows the layers in the Earth. Layer 4 is the mantle. 12341234 False! Layer 2 is the mantle

3. 2. All our evidence for changes in the Earth comes from looking at rocks. True!

4. False! Hydrogen nucleus + Hydrogen nucleus  Helium nucleus 3. Nuclear fusion is the energy source in the sun. In nuclear fusion hydrogen nuclei are joined together to make helium nuclei. This releases enormous amounts of energy. Helium nucleus + hydrogen nucleus → helium nuclei

5. True! 4. Moons go around a planet

6. 5. The death of the dinosaurs was probably due to Asteroids hitting the Earth every few million years False! It is thought that dust blocked out the sun and the Earth became cold

7. 6. Seafloor spreading is caused by shrinking of the Earth’s crust. False! Seafloor spreading is caused by movements in the solid mantle

8. 7. The outside of the Earth consists of tectonic plates. True!

9. 8. Wegener’s theory of continental drift was that different countries have different fossils. False! Wegener thought that the continents seemed to fit together

10. 9. Magnetic Stripes of the seafloor are evidence for seafloor spreading True!

11. 10. In the distant future the universe will fall back inwards due to gravity False! It is too difficult to predict what will happen to the universe in the future.