FOSSILS & CLIMATE
A fossil of a fern is found in Alaska. What does this suggest?
The area once had a warmer climate
Which layer is the thinnest?
Crust
All rocks are made of what?
Minerals
Breaking down of rock is called?
Weathering
What do tectonic plates do?
Move
What can fossils tell us about Earth’s past?
Past environments and climate
Which layer is the thickest?
Mantle
Which test identifies a mineral by its streak?
Streak test
Movement of sediment is called?
Erosion
What boundary forms mountains?
Convergent
Which fossil layer is the oldest?
The bottom layer
What is the inner core made of?
Solid iron and nickel
What type of rock forms from cooling magma?
Igneous
What happens to rocks in a fast-moving stream?
They become smaller
What boundary causes earthquakes (San Andreas Fault)?
Transform
Why might marine fossils be found on land?
The area was once underwater / land changed
Why does continental crust “float”?
It is less dense
What type of rock forms from layers?
Sedimentary
What helps reduce erosion in marshes?
Planting vegetation
What forms at divergent boundaries?
Mid-ocean ridges / seafloor spreading
How do fossils support climate change over time?
They show organisms lived in different climates than today
What is the outer core like?
Liquid
What type of rock forms from heat and pressure?
Metamorphic
Which process forms smooth rocks in rivers?
Weathering and erosion
Why are older Hawaiian islands farther away?
Plate movement