1Write the difference between a planet and a comet.
2Write the difference between erosion and deposition.
3Write the difference between the crust and the core.
4Write the difference between a meteor and a meteorite.
5Write the difference between a star and a planet.
6Give a reason: things in the inner core of the earth are in the solid state.
7Give a reason: erosion and deposition are processes that happen together.
8Give a reason: the sun is the chief source of heat and light.
9What is soil?
10Explain the process by which soil is formed.
11Why must soil be conserved?
12What are the axis and the orbit of the earth? Show them with a diagram.
13Describe the internal structure of the earth with a diagram.
14Write in points the effects caused by the earth's movement along its orbit.
15How, when and where does the change of seasons happen? Describe it with a diagram.
16Erosion and deposition are two natural processes that happen together. Make this statement clear with an example.
17Make clear, with examples, the relation between the food we eat and the soil.
18How can soil pollution be controlled?
19From time to time there are demands to ban the use of polythene bags. What has this to do with soil pollution and soil conservation? Explain.
20Give a short introduction to the different members of the solar system.
21Why is the first layer of the soil profile considered the most important one for farming?
22Mercury is the planet closest to the sun, yet it becomes very cold at night. Why?