What Is a School of Fish?
Fish schools are groups of fish that stay together. Each school is made up of one kind, or species, of fish. Some species, like the mackerel, travel together in schools...
Read More
How Does a Dam Produce Electricity?
How Does a Dam Produce Electricity? Much of the electricity we use is produced by power plants located in huge dams. Such plants, called hydroelectric plants, are run...
Read More
What Are Clouds Made Of?
Clouds are made up of very tiny drops of water or tiny crystals of ice that float in the air. Clouds form when warm air, containing moisture evaporated from the...
Read More
How Do Clouds Change Shape?
How Do Clouds Change Shape? Clouds are made mostly of tiny droplets of water floating about on currents of air. On a windy day, the air currents may stretch a cloud out...
Read More
Where Does Table Salt Come From?
Where Does Table Salt Come From? Every type of salt comes from a deposit that is created when salt water evaporates, part of a geological process in which an ocean or...
Read More