Water on Earth and in a lab

Multiple Choice

What percentage of the Earth's surface is covered by water?

• 70%

• 60%

• 50%

• 80%

Multiple Choice

What process forms heavier elements like oxygen in stars?

• Evaporation

• Nuclear fusion - Nucleosynthesis

• combustion

• cellular respiration

In the next slide, Brian Cox - a scientist- illustrates the 1796 experiments of Henry Cavendish, when he discovers that Hydrogen gas is a discrete substance, producing Water when burned!!