It is a pancake-shaped circumstellar disk of dust and gas.

It is a diffused bright objects that move slowly among the stars and may becomevisible to the naked eye.

It is above mesosphere and extends 600 km high. Aurora and satellites occur inthis area.

It contains or magnesium and are dark in color.

It refers to the quantity and quality of light reflected from the exterior surface of the mineral. 

It is made from decomposing plants and animals.

It refers to color of mark or powder left by rubbing the mineral against a streak plate.

It is a form of energy that harnesses the power of water in motion.

It is the 97% water resources that can be found on Earth.

Where can we found the largest hydroelectric dam in the world?