Environmental Management

The Earth's (a)   is surrounded by the mantle.

The (a)   floats on the mantle.

The inner core is _________

• liquid

• solid

• hot

The crust is ________ layer.

• a thick

• a thin

• an extremely hot

There are (a)   types of rocks.

These rocks are formed "by fire".

• sedimentary

• metamorphic

• igneous

These rocks are NOT the result of changes in heat and pressure.

• sedimentary

• metamorphic

• igneous

______ is extracting rock and stone from the surface.

• underground mining

• quarrying

• opencast mining

(a)   mining is extracting minerals from the surface.

Which statement is NOT true about deep mining?

• It's more difficult and more expensive.

• It involves extracting minerals by digging.

• Other names for it are open-cut and strip mining.