What is an astronomical unit? why is this unit used to measure distances in the solar system?

One AU is roughly the mean distance from the earth to the moon, more specifically its approximately 93 million miles(150million km). AU is used for measuring the distance of planets and other objects in our solar system. it is used because it provides a convinet way to express and relate distances and objects.

The sustainable use of land means using the spare land in such an activity which supports the society and benefits the environment.

In such a situation if a land is found spare then a park should be constructed on it.

This will create an recreational activity spot for the society and they will be able to spend their leisure time with fun.

Also there will be less pollution and harm to environment will be lowered by greenery and trees in the park.

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