The concentration of this molecule in the atmosphere is rising.
What is carbon dioxide?
100
The velocity of light.
What is 300,000,000 meters/second?
100
This is the primary language spoken in Brazil.
What is Portuguese?
200
Galileo observed moons around this planet
What is Jupiter?
200
This star never moves in the night sky
What is Polaris?
200
We know the concentration of carbon dioxide in the atmosphere for the past million years by studying these.
What are ice cores?
200
All types of electromagnetic radiation are the same except for this characteristic.
What is wavelength?
200
This is the capital of North Carolina.
What is Raleigh?
300
This planet has an atmosphere that is mostly carbon dioxide
What is Mars?
300
Betelgeuse is this color
What is red?
300
Sea level is rising. The water is coming from this type of formation.
What are glaciers?
300
All of these are types of electromagnetic radiation: radio waves, infrared radiation, visible light, x-rays and gamma rays. This is one more type of electromagnetic radiation.
What is ultraviolet radiation?
300
These three championships are taking place in sports right now.
What are the NBA playoffs, the Stanley Cup playoffs and the Women's World Cup of soccer?
400
Formerly known as a planet in our solar system, it is now considered to be this.
What is a dwarf planet?
400
The nearest galaxy to the Milky Way.
What is Andromeda?
400
Three greenhouse gases.
What are carbon dioxide, methane and water?
400
This type of electromagnetic radiation is given off by our bodies.
What is infrared light?
400
The tallest building in the world is in this city.
What is Dubai?
500
The axis of rotation of this planet is tilted at 23.5 degrees to the plane of its orbit.
What is the Earth?
500
The Sun is this type of star.
What is Main Stage?
500
The study of trees.
What is dendrology?
500
This is the reason that stars are hot.
What is nuclear fusion?
500
This was the original technology used for renting movies for home use.