The limestone topography is affected through which of the following weathering process?

1. Physical weathering
2. Biological weathering
3. Oxidation
4. Carbonation

Waterfall is formed due to the erosion by which of the following agent?

1. Wind
2. Underground Water
3. River
4. Glacier

In which course of the river the river erosion is more lateral than vertical?

1. Upper course
2. Middle course
3. Lower course
4. All the above

Which of the following features is observed in this image?

1. Delta
2. Meander
3. V shaped valley
4. Rapids