The leaves of the plant turn energy from the sun plus carbon dioxide into sugars and oxygen using photosynthesis. The horse eats plants and gains energy. The horse then performs work when it pulls the wagon.

Sun’s energy → photosynthesis makes the tree grow → tree is burned in pit with little oxygen → charcoal is burned → meat is cooked on the grill.

The sun’s energy causes water to evaporate from oceans and lakes. Next the water cycle causes rain to fall. A lake fills up. Water flows from the lake through a power plant. Electricity flows through power lines and into a house. A boy plugs in his hair dryer and the dryer heats up and blows air.