How long after an earthquake does a tsunami hit?

What is associated with mid-ocean ridges?

How are farmers that use no plow farming methods able to improve air quality for the people around the fram

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.