When a huge amount of soil, rock or debris slides down a sloped part of

Rain supports all life forms on Earth. It provides the Earth with fresh water and

The rising and falling of the level of the ocean due to the gravitational pull

Writing an essay allows a person to express their thoughts and opinions on a subject

Adaptation–physiological or behavioural–is a feature that enables animals to adjust and survive in their current

Fish, just like humans and land animals, need oxygen to survive.