Across
- 3. It contains substances that are necessary for living things.
- 4. It is essential for animal and plant life. We use it for agriculture and forestry.
- 5. It is used to produce electricity in specific places.
Down
- 1. It is a thick black liquid with which we get many important products.
- 2. All living things consist of these.
- 6. They are made with minerals.