Key stage 3 Science Exercise
1. Litmus paper indicates us whether a solution is an ________ or an alkali.
2. Litmus paper turns blue in alkaline and _______ in acidic solutions.
3. Metals react with ______ in the air to produce metal oxides.
4. Non-metals react with oxygen to make _________ .
5. Metal oxides are _______ .
6. Non-metal oxides are ________ .
7. The earth is made up of ________ layers.
8. The earth has four layers: outer core, inner core, mantle and _______ .
9. The outer layer of earth is called ______.
10. The crust is made up of _________ .
11. There are three types of rocks igneous, metamorphic and _______ .
12. Igneous rocks are formed from ________ .
13. Sedimentary rocks are formed from _______ .
14. Metamorphic rocks are formed because of ________ .
Answers: 1. acid 2. red 3.oxygen 4. non-metal oxides 5. alkaline 6. acidic 7.4 8. crust 9. crust 10. tectonic plates 11. sedimentary 12. magma 13. sediments 14. heat and pressure