Which of the following statements in respect of landslides are correct?

1. These occur only on gentle slopes during rain.

2. They generally occur in clay-rich soil.

3. Earthquakes trigger landslides.

Consider the following features about a geographical phenomenon :

1. Torrents of snow and ice roaring down a steep mountainside

2. It is hazardous to skiers and mountaineers

3. It involves a mix of falling, rolling, sliding and flowing of materials

According to the Indian Meteorological Department, which of the following is/are the feature/features of cloudburst? 

1. Heavy precipitation in short period of time in a limited geographical area

2. It occurs generally during monsoon period and triggers flash flood and landslides

In a group discussion on shape and size of the Earth, three students stated the following points :

1. Student 1: The shape of the Earth is basically an oblate spheroid.

2. Student 2: The polar diameter of the Earth is more than the equatorial diameter.

3. Student 3: Bulge along the equatorial region is due to revolution of the Earth.