What is the primary way that metamorphic rocks form?
lava erupts from earth and cools.
water, wind, and gravity move particles from one place to another.
rock fragments break apart and collect as sediment.
existing rocks join together under high heat and pressure.

Melissa lives in a town called greendale. she discovers that when she lights a match and holds it near her kitchen faucet, the little flame grows into a larger fire. melissa is surprised because she thought the water would extinguish the flame rather than ignite it further. her mother tells her that the water might be contaminated with dissolved methane, a primary component in natural gas. melissa investigates the matter and finds that cases of methane contamination started shortly after a company began fracking for natural gas in the area. based on this information, which three statements are plausible consequences of fracking in greendale?

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.