Questions

Our Ex. Prime Minister Rajiv Gandhi was Pilot by profession before he entered politics.

The term for classifying and grouping organisms is Taxonomy. It is the science of defining and naming groups of biological organisms on the basis of shared characteristics.

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

The thinnest layer is crust. It is about 100km. Where as mantle ranges upto 2900 km and the inner most core ranges upto 6300km.