In 1940, the tacoma narrows bridge across the puget sound collapsed. the bridge was a suspension bridge. the wind blowing through the narrows matched the natural frequency of the bridge. this resulted in a large movement of roadway, which eventually caused the bridge to fail. what characteristic of waves caused the bridge to collapse?

absorption, because the bridge absorbed all the energy of the wind
diffraction, because the wind moved around the bridge, which set the bridge into motion
interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge
interference, because destructive interference occurred when the wind frequency matched the natural frequency of the bridge

For those of you taking it on Edge, the answer is C.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.