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.
We use energy to warm our homes and toast our bread. Scientists are busy researching new ways to make energy available for our use. The sun seems an inexhaustible source of energy. Energy from the sun lights the sky and warms the planet. The energy from the sun is a type of nuclear energy or energy created from nuclear reactions.