Review

Which of the following is the outer most layer of the earth?

• Crust

• Mantle

• Core

• Inner core

A subsystem which includes all earth's water, like lake, river, oceans.

• Lithosphere

• Water sphere

• Hydrosphere

• Geosphere

A subsystem includes all living organism like plants, animals and humans

• Hydrosphere

• Geosphere

• Biosphere

• Atmosphere

What is the hardest mineral

• Gold

• Diamond

• Silver

• Bronze

All are properties of a mineral EXCEPT

• Color

• Density

• Cleavage

• Hardness

An example of a renewable resource

• Petroleum

• Coal

• Solar power

• Natural gas

The practice of planting trees to replace those that have been cut down

• Deforestation

• Afforestation

• Reforestation

• Forestation

During Big Bang, the first gases formed were;

• Hydrogen and Nitrogen

• Hydrogen and Carbon

• Hydrogen and Helium

• Hydrogen and Oxygen

All are layers of the Earth EXCEPT

• Crust

• Mantle

• Core

• Lithosphere

Crust, mantle and core are what type of subsystem?

• Hydrosphere

• Geosphere

• Biosphere

• Atmosphere