How many seismographs are needed to locate an earthquake

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes. b. it burns more cleanly than crude oil products. c. scientists have developed new ways of extracting it. d. during its extraction, groundwater can be contaminated.

Liquefaction is a. a quicksand-like condition arising in some wet soils during earthquakes. b. flooding caused by tsunamis. c. flooding of coastal areas due to tectonic subsidence. d. flooding caused by dam failure resulting from an earthquake.

Which phrases apply to metamorphic rocks? check all that apply. form under extreme heat and pressure form from existing rocks form from magma and lava form when sediments combine form from volcanic eruptions