This process involves using plants to absorb and accumulate toxic material. once contaminants are absorbed into plants, the plants themselves are usually toxic and must be landfilled. the cost of this process can be less than half the cost of landfilling or treating toxic soil.

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.