Which of the following features is observed in this image?

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

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

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

Observe the image given below and answer the questions that follow.

Image 1

Image 2

Your cousin brother has sent these images to you after visiting Sahara Desert with his family. He was surprised to see the various types of sand dunes found in the desert. From your geographical point of view identify the images sent by your cousin. Also explain why they have different shape?

One of your friends had visited the Bora cave where she had observed some beautiful features made of limestone inside the cave.

Can you explain the formation process of such limestone topography? Which type of weathering is observed here?