Select from the dropdown lists to complete the text.
Rocks in the Earth's crust are classified by the way that they are formed.
Complete these questions about rock formation. (Use words from the drop-down lists.
a) ( igneous, sedimentary, metamorphic ) rocks are formed when molten lava from a volcano cools down.
b( metamorphic, igneous, sedimentary ) rocks are made from grains of rock that are cemented (stuck) together.
c) ( igneous, metamorphic, sedimentary ) rocks are made when heat and pressure change other types of rocks.
d) ( sedimentary, igneous, metamorphic ) rocks are made of layers and often contain fossils.