Historic time capsule found at Washington Monument. Before you go, we thought you'd like these... BALTIMORE (WBAL) -A piece of history has been discovered in Baltimore. The original cornerstone of the Washington Monument in Baltimore, thought to be long lost, was discovered last week while crews dug for a sewage tank.
We divide our energy use among four economic sectors: residential, commercial, transportation, and industrial. Heating and cooling our homes, lighting office buildings, driving cars and moving freight, and manufacturing the products we rely on in our daily lives are all functions that require energy.
Solar energy is used today in a number of ways: 1  As heat for making hot water, heating buildings, and cooking. 2  To generate electricity with solar cells or heat engines. 3  To take the salt away from sea water. 4  To use sun rays for drying clothes and towels.