What do you mean by 'Black Hole' in our solar system ?

In which year did Galileo state that the Earth revolves around the Sun ?

Human geography is also known as

With reference to 'Changpa community of India', consider the following statements :
1. They live mainly in the State of Uttarakhand.
2. They rear the
3. Pashmina goats that yield a fine wool.
4. They are kept in the category of Scheduled Tribes.

Which of the statements given above is/are correct?

The behavioural environment is meant by

An early statement of Geography as Chorology was provided by

The heavier silicates named 'Sima' or silica + magnesium are most abundant in the ________ 

The process of water getting evaporated from the surface of leaves is known as

What is the correct sequence of the following in the context of the age of the earth since its origin?
1. Cenozoic
2. Mesozoic
3. Palaeozoic
4. Protozoic

Which of the following statements regarding the International Date line are correct?
1. It is a longitude of 180°
2. It is determined by 180° longitude but is not a straight line
3. It is a Greenwich meridian helping in fixing time and date
4. It solves the problem of time and date among the World's nations