a source of water heated naturally by the earth
A hot spring is generally a pool of warm water.

a non-living substance often found in rocks
I always drink mineral water.

a dead body that is treated before being buried
There is an Egyptian mummy in the museum.

primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
Some algae, fish, and birds can live in or around the lake.

Convection is the flow of hot air through gas or liquid.
An example of convection is water boiling in a pot.

to cause harm by flame or heat
I burned some wood in the camp fire.

to move from one place to another
Convection is the transfer of heat energy.

to save or use slowly
Refrigerators preserve food from spoiling.