Questions

Iteration is most similar in meaning to the word repeatation i.e, looping.

The river which starts flowing from Himalayas on the North to southwards to empty in the Arabian sea is Indus River.

The process which wherein an Ecosystem may renew itself is known as Ecological Succession.

The time scale may be decades or a million of years after a mass extinction. 

It may be achieve over a period of time.

Indica is the book written by Greek historian "Megasthenes" in which he described India like how is the Indians life, what way of life is followed, etc...

Ornate means which is beautiful, lavish one. Opposite of Ornate is ugly, offensive, dull or plain.