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Chemistry

100

When a metal and a non-metal interact.

What is an ionic compound?

200

When two non-metals interact 

What is a covalent compound?

300

When a metal reacts with oxygen 

What is corrosion?

400

Corrosion with more speed 

What is Combustion?

500

When one reactant breaks down into several products 

What is decomposition?

Earth and Space

100

When N2 becomes NO3-

What is Nitrogen fixation?

200

Animals exhale 

How does carbon go from the biosphere to the atmosphere?

300

Some gases in the atmosphere (water vapour, car dioxide, methane, nitrous oxide and ozone) trap heat close to the Earth‘s surface keeping it warm 

What are Greenhouse gases?

400

If there are too many greenhouse gases in the atmosphere the effects is enhanced 

What is the enhanced greenhouse effect?

500

Long-term averages of weather conditions (temperature, rainfall and wind speeds)

What is climate?

The universe

100

a vacuum so powerful it can suck in light

What is a black hole?

200

G-type main-sequence star

What type of star is our sun?

300

physical theory that describes how the universe expanded from an initial state of high density and temperature.

What is the Big Bang theory?

400

an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.

What is the Doppler effect?

500

In simple terms, when an object is moving away the wavelength of any radiation it emits is stretched. Longer wavelengths are red.

What is Red Shift?