Which rocks are made of broken up pieces of other rocks?
sedimentary rock
What is breaking up rocks with heat and cold called?
weathering
What is the hollow the river cuts out of the rocks called?
valley
What word describes how a river uses broken up rocks to cut out a valley?
erosion
What is the process called when sediments build up in layers on the sea bed?
sedimentation
Which sedimentary rock is made from broken up shells?
limestone
Which sedimentary rock is made from very fine-grained sediments?
shale
What do we call an animal's remains preserved in rock?
a fossil
What type of fossil is an imprint of the animal or plant?
a mould
If a mould fills with minerals, what type of fossil do we get?
a cast
What is the main characteristic of igneous rocks?
It is crystalline.
What is an igneous rock that forms on the surface of the Earth?
extrusive igneous rock
What do igneous rocks come from?
magma
What does the word "igneous" mean?
fire
