The answer is - wavelength.
As the wave approaches the shore and it reaches shallow waters it's characteristics start to change. When the wavelength is half of the water depth than the bottom of the wave starts to drag on the ocean floor. As it starts to do this the wave starts to slow down at it bottom as it approaches the beach but the upper part of the wave maintains its initial speed. Because of this the wave becomes longer. Once it reaches the shore it crashes on it and falls apart.
The correct answer is - B. 9%.
The United States, even though are one of the biggest investors in the development of usage of renewable energy, are still not very willing to use them as much and are mostly sticking to the nonrenewable energy resources. This is mainly due to the economic factor, and the United States are not a country that accepts any downfall in its economy, especially not if it doesn't have to. This also causes a lot of controversy because it is damaging the environment, and while lots of developed countries are focusing on the usage of the renewable energy resources, the United States refuse to do so even though they are one of the two biggest polluters in the world.
