1. Fossil fuels were formed from ____.
a) ancient plants and animals b) carbon c) water
2. Chemically fossil fuels are ___.
a) compounds of oxygen b) acids c) hydrocarbons
3. When these fuels burn they ___ energy.
a) annihilate b) absorb c) release
Text 2. Where do Rainbows Come from?
Light bends as it travels from one location to another, due to the different speeds at which it travels through different mediums. This process of natural bending is referred to as refraction. When light passes through a prism, the different colours of the light refract out at different angles, dispersing and becoming individually visible to the human eye. The same principle applies when light passes through a droplet of water in the air. If enough light passes through enough droplets in a confined area, the refracted pattern of light is visible to humans as a bent stripe of multiple colours, known everywhere as a rainbow.