A chemical reaction
The final frontier
I bless the rain
Know yourself
Memento mori
100

70% of the planet consists of this compound. It is also sure to quench your thirst.

H2O/water

100

The largest planet in our Solar system

Jupiter

100

The name of the desert that covers much of northern Africa

Sahara

100

A fist-sized muscular organ that pumps blood throughout the body

Heart

100

A tool Death is often pictured using to harvest the souls of dead humans

A scythe

200

The chemical symbol for gold

Au

200

The galaxy the Earth is located in

The Milky way

200

The name of the longest river in the world

Nile 

200

Number of bones in the human body

206

200

Favorite game of the Grim reaper

Chess

300

Chemical symbol for the gas that makes you laugh

He

300

The only natural satelite orbiting Earth

Moon

300

The biggest island in Africa

Madagascar

300

These are crucial components of the immune system, protecting the body against infection and disease

White blood cells

300

Average global life expectancy 

72 years

400

The hardest natural substance found on Earth

Diamond

400

Name of the space mission that landed on the Moon

Apollo 11

400

This dormant volcano is the highest mountain in Africa

Mount Kilimanjaro

400

Largest organ of the human body

Skin

400

God of death in the Greek mythos

Thanatos

500

Process by which electric current is passed through a substance to effect a chemical change

Electrolysis

500

The approximate speed of light in km/s or miles/s if you're British

300 000 km/s or 186 000 M/s

500

City in which the 2010 football world cup final was played

Johannesburg

500

A small, almond-shaped part of the brain that is primarily used to regulate your emotions

Amygdala

500

This country has the highest life expectancy

Monaco