Aitch-Two-Oh?

Question: How did early ships move through the water?

Answer: Ancient Egyptian warships had at least 40 oars, pulled by men, and a single sail to catch the wind and move across the seas.

Question: Which kind of power is generated by harnessing water?

Answer: Hydroelectric power is derived by harnessing the power of moving water. Some dams, for example, have turbines that can generate electricity.

Question: What causes the tides?

Answer: Tides, the rise and fall of ocean levels, are a way that ocean water moves. The pull of a force called gravity between Earth and the Moon and the Sun causes tides.

Question: What was steam power developed to do?

Answer: Patented in England in 1698 to pump water from coal mines, steam engines spread through Europe and later powered textile mills, sawmills, railroad trains, and ships.

Question: What is the name given to a jet of natural steam or hot water?

Answer: A geyser is a jet of steam or hot water from underground thermal sources.

Question: How much of the Earth’s water is on land?

Answer: Oceans cover nearly 71 percent of Earth’s surface. They contain almost 97 percent of all the water on Earth.