Fresh air, fresh water, biomass, all these represents which resources?
Renewable
Potentially renewable
Non- renewable
All of these
What entered the atmosphere from bacteria?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
Plant and animal life continued to develop over millions of years until the earth reached its present balance of:
Chemicals
Gases
Energy
Natural cycles
Which is used in cryogenics?
Liquid nitrogen
Argon
In the beginning earth was a ball of molten:
Rock
Clay
Matter
Metal
When rocks are broken down by the action of weather, the particles of rock are transported , deposited and buried to form:
Metamorphic rocks
Igneous rocks
Sedimentary rocks
Molten rocks
The first atmosphere was mainly formed from:
Oxygen and water vapour
Nitrogen and water vapour
Carbon dioxide and water vapour
Hydrogen and water vapour
In the Haber process, which of the following is produced by taking nitrogen from the air?
Insecticide
Pesticide
Fertiliser
Limestone
The rock cycle is a very slow process as the plates of the earth's crust are moving only a few:
Decimetres each years
Centimetres each years
Millimetres each years
Metres each years
The boiling point of oxygen, nitrogen, argon and neon are -183o C , - 196oC and -246oC respectively. Which of these has lowest boiling points ?
Neon
