Grade 7 - Inside our Earth and Our Environment

The uppermost layer over the earth’s surface is called :

• Crust

• Mantle

• Core

The main mineral constituents of the continental mass are :

• silicon and aluminium

• silica and nickel

• silica and alumina

• silicon and magnesium

Three major types of rocks:

• igneous

• sedimentary

• metamorphic

• sial

• sima

Tajmahal is made of

• Sandstone

• Marble

• Granite

• Basalt

The Earth's inner core is 

• a layer of hot rock
• a dense ball of solid metal
• a layer of molten metal
• part of Earth's outer skin

- - - - because people pollute lakes, rivers and oceans with garbage and oil.

• People cut down rainforest

• Sea life and birds are in danger

• Icebergs are melting in the Arctic

• Greenhouse gases keep the earth warm

using items over and over again or in a new way ...

• natural resources

• particulates

• recycling

• conservation

That picture shown ...

• noise pollution

• air pollution

• water pollution

• land pollution

That picture, shown ...

• soil pollution

• water pollution

• air pollution

• noise pollution

Sources of Noise Pollution

• voice of guitar

• voice of piano

• voice of transportasion like bus/train

• voice of fan