________ protects us from the harmful ultraviolet radiation.

When nitrogen reacts with hydrogen under high temperature and pressure ammonia, which is also a gas is formed. This is an example of:

Cooking of rice is an example of:

The process of depositing a layer of zinc on iron is called 

Identify the substance that evaporates at room temperature:

When a solid directly turns into gaseous state, it is called:

The formation of rust on the surface of iron is called __________ of iron.

Properties such as shape,size,colour and state of a substance are called its ________ properties.

A seed growing into a tree is an example of:

Photosynthesis is a _________ change.