True or false: for a low-pressure system to strengthen, the surface air pressure must decrease. select one:

a. True

b. False

How much would it cost to cover the entire land area of United States with dollar bills? To answer this question, you may find the following information useful: The contiguous United States (all of the states minus Alaska and Hawaii) can be

Which heat source continues to contribute to earth's internal heat?

Which features do sound waves have the ocean and light waves do not

Which best describes why a chemical change is different than a physical change? A. A chemical change results in a different state of matter, and a physical change results in a new substance being formed. B.

The biosphere contains The oceans All plants and rocks All the earth All the living things

a boy hears the echo of his own voice from a distance hill after 0.8 seconds. If the speed of sound in air is 340m/s, calculate the distance of the hill from the boy.

Which of the following are found in plant cells buh not animal cells?

The diagram shows the field lines near the poles, X and Y, of two magnets Based on the field lines, what are the poles of the magnets? O X: north Y south X: south Y north X north Y north Х Y X south Y south

Why is it safe to watch an eclipse of the Moon but not an eclipse of the Sun

A student holds two pieces of paper at the top, 10 cm apart. The flat sides of the papers face each other. What happens when the student uses a straw to blow a stream of air between the papers?