Question

10 Why is CNG called ‘clean fuel’?

11)How the pressure actng on a body change when the area is increased?

12)Why are weeds undesirable for crops? Give reasons to support your answer.

13)Write the history of formaton of coal.​

Answer 1

Answer:

1. CNG called as fuel because .it has the potential to to work .
2. Pressure is inversely related to area , as the area decreased pressure will increased or vice-versa.
3. weed are undesiable for crops because weed are the plants that are not useful for the crops ..as it make a competion with crops for nutrition for soil.
4. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.