OUR ENVIRONMENT CLASS 7

Which is not a natural ecosystem?

• Desert

• Aquarium

• Forest

Which is not a component of human environment?

• Land

• Community

• Religion

Which is a human-made environment?

• Road

• Mountain

• Sea

Which is a threat to environment?

• Growing plant

• Growing population

• Growing crops

The rock which is made up of molten magma is

• Igneous

• Metamorphic

• Sedimentary

The innermost layer of the Earth is

• Crust

• Core

• Mantle

Rocks which contain fossils are

• Igneous rocks

• Sedimentary rocks

• Metamorphic rocks

The thinnest layer of the Earth is

• Crust

• Core

• Mantle

When precipitation comes down to the Earth in the liquid form, it is called

• Snow

• Cloud

• Rain

Which of the following gases protects us from harmful sun rays?

• Nitrogen

• Ozone

• Carbon Dioxide