At the beach, describe where or when you would see wave
fronts. how are wave fronts useful to surfers?

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When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents