Igneous Rocks

1. – a sheet of igneous rock that cuts across existing rock layers.
3. – an igneous rock containing large crystals embedded in a fine-grained groundmass.
7. – a coarse-grained intrusive igneous rock similar in composition to basalt.
8. – a very coarse-grained igneous rock with exceptionally large crystals.
9. – a sheet of intrusive igneous rock that forms parallel to existing rock layers.
11. – a dark volcanic rock containing many gas cavities.
12. – a volcanic glass formed by the rapid cooling of lava.
14. – describing igneous rocks that form when lava cools rapidly at the Earth's surface.
16. – a large body of intrusive igneous rock that solidified beneath the Earth's surface.
18. – molten rock found beneath the Earth's surface.

1. – an intrusive igneous rock containing feldspar and dark minerals.
2. – molten rock that has reached the Earth's surface.
4. – a light-coloured extrusive igneous rock with a high silica content.
5. – an extrusive igneous rock with an intermediate composition.
6. – a massive intrusive igneous body covering a large area.
10. rock – a rock formed by the cooling and solidification of magma or lava.
13. – a coarse-grained intrusive igneous rock rich in quartz and feldspar.
15. – describing igneous rocks that form when magma cools slowly beneath the Earth's surface.
16. – a highly porous volcanic rock formed from gas-rich lava.
17. – a dark, fine-grained extrusive igneous rock formed from rapidly cooled lava.