Igneous
What does all igneous rock form from?
Volcano: Lava or Magma
What is the first step in the formation of sedimentary rock?
layers of sediment build up
What type of rock forms when melted rock cools and hardens?
igneous rock
How does magma become igneous rock?
Cools and hardens.
What happens to older layers of rock as newer layers settle on top of them?
the older layers are squeezed together and harden
What type of rock forms when existing rock is changed by heat or pressure?
metamorphic rock
How are fossils formed?
When a plant or animals dies and is burried under mud and silt. Soft tissue decomposes, leaving bones behind. Sediment builds up on top and hardens into rock.
What is the name for igneous rock that forms deep within a volcano?
Intrusive
What holds the sediment together as sedimentary rock forms?
minerals between the sediments
What type of rock forms when small pieces of rock and other materials settle on top of each other and become squeezed together?
sedimentary rock
What kind of tools are used to uncover fossils?
a pick with a sharp point to dig out the fossil and a brush to push away the dirt
What is magma called when it flows onto Earth's surface?
lava
Describe how sedimentary rock is made.
Sand is buried. The lower layers are squeezed by the weight of the material above. Minerals are deposited among the grains of sand, cementing them together and forming rock.
Sandstone is a type of rock with layers, what type of rock is it?
sedimentary
Do intrusive or extrusive rocks have bigger crystals?
Extrusive
Which type of rock can form quickly on Earth's surface or slowly underneath Earth's surface?
igneous rock