The world's largest reef system is The Great Barrier Reef. It has approximately 900 islands and 3,000 individual reefs. It also stretches for 2,600 km.

The study of what is under the earth's surface through measuring its vibrations is called seismology. The person who performs the study is a seismologist.

The ozone layer absorbs ultraviolet light that could destroy the planet. It also protects all living and nonliving things on earth against the sun's harmful rays.

In the Southeast Asian countries, the seasonal rains are called the monsoon. Generally, the monsoon season takes place during the months of June to September.

Ruby stemmed from the Latin term Rubens which means red. The ruby gemstone appears with various tones of red: darkish, pigeon blood, and pinkish red.

The German scientist and meteorologist Alfred Lothar Wegener was the noble proponent of The Continental Drift Theory. He proposed the theory in 1912.

A diamond is one of the most stunning gemstones of all time. It is also recognized as a symbol of both love and a gift.

Most of the dinosaurs came into being in the Cretaceous period. However, there were vast numbers of dinosaurs that lived in all three periods.

There are four elements that make up almost 90% of the earth. Iron and oxygen are the two elements that comprise most of the earth's mass.

The biggest tropical desert on earth is the Sahara Desert in Africa. It struck a vital purpose in promoting the culture and tradition of Africans.