Earth acts as a huge bar magnet. Why? Give reasons.

Though Earth is acting as a huge bar magnet it is not attracting other ferromagnetic materials. Why? Give reasons.

Desert does not have water.Why?Give the reason.

Forests act as carbon sink. Give reason.

Resistance in the airways is typically low. Why? Give two reasons.

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earths horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earths field by placing a current carrying wire, the new time period of magnet will be

Topic enrichment - Project. Make a fruit or vegetable salad. Give reasons why you think it is a mixture.