rocks

our earth is a huge ball of ______

• water

• rocks

________ wear away and make deep valleys.

• oceans

• rivers

rocks are ______ materials.

• natural

• man-made

granite and marble are _____ rocks.

• soft

• hard

____ is a soft rock.

• slate

• clay

permeable rocks allows water to soak inside them.

• yes

• no

people often _____ to take rocks out.

• dig

• fill

_______ is a process of digging valuable rocks .

• mining

• cleaning

The broken pieces of rocks are called______

• aggregate

• tunnelling

coal, gas and mineral oil are known as ________.

• fuels

• floods