What are the cataracts of the Nile?

The cataracts of the Nile are shallow and stretches between Aswan and Khartoum where the water's surface is broken by numerous small boulders and stones that lie on the river bed, as well as many small rocky islets. This is called "rapids or "white water". River cataracts often go with a rapid down-drop of the river.

Explanation:

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

hope this !