Riddle me this: What is it: That has teeth, And can't eat? (if you need help - click here for a hint) Refer to the Garden Safety Rules and tell me what rule applies to the answer to the riddle.

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer