5 Questions
Which layer of the Earth is the thinnest?
Crust
What are the two types of crust called?
Continental and oceanic
Which layer of the Earth contains convection currents that move the tectonic plates?
Mantle
What is the outer core made up of?
Mostly liquid iron and nickel
Why do scientists believe that the inner core is solid?
It has immense pressure on it from the layers above
Study Notes
Earth's Layers
- The crust is the thinnest layer of the Earth, with a thickness ranging from 5-70 km.
Types of Crust
- The two types of crust are continental crust and oceanic crust.
Mantle
- The mantle is the layer of the Earth that contains convection currents, which are slow, circulating movements of hot, viscous rock that move the tectonic plates.
Outer Core
- The outer core is a liquid layer, composed of a nickel-iron alloy, and is about 2,250 km thick.
Inner Core
- Scientists believe the inner core is solid due to seismic data, which shows that seismic waves generated by earthquakes travel faster through the inner core than through the outer core, indicating that it is more rigid.
"Grade 4 Science Study Guide Quiz: Name of Earth Layer Key Facts" - Test your knowledge of the different layers of the Earth with this quiz. Learn key facts about the Earth's crust, including its thickness and variations between continental and oceanic crust. Perfect for preparing for your upcoming science exam!
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