Fill in the blanks:

(a) The …………… Nile is a tributary of river Nile.

(b) River Nile is …………… km long.

(c) The Nile Delta is …………… km wide.

(d) Fold mountains are remnant of …………… old fold mountains.

(e) Africa is called 'Dark Continent' because it could not be …………… by the Europeans.

(f) …………… is the highest mountain in Africa.

Explain the following:

(i) Isthmus

(ii) Strait

(iii) Block mountains

(iv) Rift Valley

State the latitudinal and longitudinal extent of Africa.

Name the water bodies surrounding the continent of Africa.