Students will learn that although we use trees for many things in our daily lives, if we plan carefully, we will never run out of trees. Some of the natural resources that we use cannot be replaced. We burn gasoline in our cars.
Gasoline comes from oil that took millions of years to make deep within the earth.
Coal is often used to make the electricity that lights our homes. Coal, too, took millions of years to make. Trees are called a renewable resource because they can be replaced. But that does not mean we can waste trees. It takes a long time to replace a tree.