Science exercise grade seven

1) What is the difference between renewable and non-renewable resources?

2) How does the greenhouse effect contribute to global warming?
3) What is the process of photosynthesis and why is it important?
4) Describe the structure and function of a cell.
5) Explain the difference between a physical change and a chemical change.
6) How does electricity flow through a circuit?
7) What is the difference between a mixture and a compound?
8) Describe the process of digestion in the human body.
9) What is the importance of biodiversity in an ecosystem?
10) How does gravity affect objects on Earth and in space?