Scientists have established that some of the layers of earth are solid, some are liquid, and some are semi-fluid. explain how the scientists are able to determine the liquid and solid layers. use at least two pieces of evidence to support your answer.

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary