Roots: photo, rad/radi/geo/terra

A terrarium is an enclosure to keep small animals and plants.

The root rad/radi means shine or ray.

It means the sun emits heat and light.

The root photo means light.

The root geo means earth.

The root 'terra' refers to land or earth.

An example is 'photograph', which means a picture made using light.

In geography, 'geo' signifies the study of the earth.

It is commonly used to describe how heat spreads from a source, like a heater.

Light is essential for photosynthesis, as plants use it to convert carbon dioxide and water into glucose.