Layers of Earth
What are the 4 main layers of Earth?
Crust, mantle, outer core, and inner core
What are the 4 eras that make up Earth's history?
Precambrian, Paleozoic, Mesozoic, and Cenozoic
What are the two main types of waves?
Mechanical and Electromagnetic
What phase is our sun in right now?
Main sequence
Where is the asteroid belt found?
Between Mars and Jupiter
What is the largest layer of the Earth?
Mantle
How old is the Earth?
4.6 billion years old
What are 3 examples of mediums that waves use to travel through?
Solid, liquid, and gas
After it's main sequence, what does a low mass star become?
Red Giant
What is a meteor?
A meteor is a meteoroid that enters Earth's atmosphere.
Which layer of the Earth is liquid?
Outer Core
What is the difference between relative age and absolute age?
Relative age is approximate. Absolute age is exact.
Which has a longer wavelength visible light or ultraviolet?
Visible light
Interstellar Medium is made up of what gas and what dust?
Hydrogen and Carbon
What is a meteorite?
A meteoroid that survives through Earth's atmosphere and lands on Earth.
How does the outer core create Earth's magnetic field?
Movement of iron and nickel
Explain the law of superposition.
The oldest layer of rock is at the bottom, and the youngest layer is at the top.
What is amplitude?
The distance of the wave from the resting point.
What is nuclear fusion?
When two hydrogen atoms collide into each other and they fuse. This releases energy in the form of light and heat.
What comets made out of?
Ice and gas
Explain IN DETAIL convection currents? Where do they occur? Why do they occur? How do they affect the crust?
Occur in the mantle. Heat from the core heats up the molten material in the mantle making it less dense. Hot material rises, cools down, and sinks because cold material is more dense. Because of this, the crust moves, causing the movement of tectonic plates.
What was the first organism to produce oxygen?
Cyanobacteria
The increase or decrease in sound as the observer or object move closer or away from each other.
Why does a red giant explode at the end of it's phase?
The gravity cannot keep the outer gas layers together anymore.
What is the belt that comets come from? What is the cloud that comets also come from?