Types of Rocks
What are the three main types of rocks?
— Igneous, sedimentary, metamorphic
What is magma?
— Melted rock below Earth’s surface
Melted rock inside the Earth is called what?
— Magma
What type of rock has layers?
— Sedimentary rock
In which type of rock are fossils usually found?
— Sedimentary rock
Which type of rock forms from melted rock cooling?
— Igneous
What do we call magma when it reaches the Earth’s surface?
— Lava
Melted rock on the Earth’s surface is called what?
— Lava
What are small pieces of rock called?
— Sediments
What can fossils be made of?
— Bones or imprints
Which type of rock forms in layers?
— Sedimentary
How do igneous rocks form?
— From magma or lava cooling and becoming solid
Where is magma found?
— Inside the Earth
What process presses sediments together?
— Compaction
How are fossils formed?
— Organisms are buried by sediments over time
Which type of rock is most likely to contain fossils?
— Sedimentary
Name one feature of igneous rocks.
— Hard / has crystals / made from melted rock
What happens when magma or lava cools?
— It becomes solid rock (igneous rock)
What process glues sediments together?
— Cementation
Why must organisms be buried quickly to form fossils?
— To prevent decay
— They form in layers and can trap organisms
Why do igneous rocks usually NOT contain fossils?
— The heat destroys fossils
Compare magma and lava. How are they similar and different?
— Both are melted rock; magma is inside Earth, lava is on the surface
How do sedimentary rocks form step by step? —
Sediments → compaction → cementation
Why are fossils important for scientists?
— They help us learn about the past