What Causes Waves(波浪)?

Waves are beautiful to look at, but they can do great harm to s (1) at sea, as well as houses and buildings near the shore. What causes waves? Most waves are caused by winds blowing over the s (2) of the water. The sun h (3) the earth,causing the air to r (4) and the winds to blow. The winds blow across the sea, pushing little waves into bigger and bigger o (5) .

The size of a wave is d (6) by how strong the wind is, how l (7) it blows, and how large the body of water is. In a small bay(海湾)big waves will never build up. But at sea the wind can build up giant, powerful waves.

It is believed that the height of a wave(in meters)will usually be no m (8) than one-tenth of the wind's speed(in kilometers). In other words, when the wind is blowing at 120 kilometers an hour,most waves will be twelve meters high or less. Of course,some waves m (9) combine to form giant waves that are much h (10) .