The cyclic flow of chemical elements between organism and environment in biosphere is known as -

The scale used for measuring earthquake intensity is ___________.

The solid portion of the earth on which we live is called the:

In dry areas, salts forming a hard soil layer are called:

Mediterranean wild shrubs are in which climate zone?

Which of the following is a metamorphic rock?

In which of the following atmospheric layers do Meteorites burn up on entering from space?

What is the most common cause of tsunamis?