ROCKS

igneous rock- Rock that has been formed from magma or lava

sedimentary rock - Rock that has been formed by layers of sediment being pressed down hard and sticking together. You can see the layers of sediment in the rock.

metamorphic rock - Rock that started out as igneous or sedimentary rock but changed due to being exposed to extreme heat or pressure.

magma - Molten rock that remains underground. 

lava - Molten rock that comes out of the ground is called lava.

sediment - Natural solid material that is moved and dropped off in a new place by water or wind, e.g. sand.

permeable - Allows liquids to pass through it.

impermeable - Does not allow liquids to pass through it.