Properties of the Earth
The sun is a big, hot ball made of ____________.
What is gas?
The two days of the year where every place on Earth has 12 hours of daylight and 12 hours of darkness.
What are the spring and fall equinox?
This is one of the two gases found in Earth's atmosphere make up the sun.
What is hydrogen or helium?
The orbit of Earth around the sun is not exactly circular but rather this shape.
What is elliptical?
The type of nuclear reaction that produces all of the sun's energy.
What is nuclear fusion?