Which statement best describes tornadoes? 1: Tornadoes form when the earth’s plates move under the ocean and massive waves hit land.

2: Tornadoes have spinning downdrafts and updrafts that form a funnel cloud.

3: Tornado winds are huge, swirl in a circle, and form over tropical water.

4: Tornadoes form when warm and moist air rises and cumulonimbus clouds form.

Why have the aztec ruins in mexico city not been dug up?

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups. b. a researcher conducts a linguistic study of comments posted on a local public blog. c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression. d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.

Describe the relationship between population growth consumption and the environment.