A ship is mapping the structure of the ocean floor using sonar technology. Which statement describes the basic method used in this type of mapping? A radio wave is sent from the ship and reflects off the ocean floor back to a receiver on the ship.

A. A radio wave is sent by the ship and is absorbed by the ocean floor.

B. A radio wave is sent by the ship and is absorbed by the ocean floor.

C. A sound wave is sent by the ship and is absorbed by the ocean floor.

D. A sound wave is sent by the ship and is absorbed by the ocean floor.

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins. co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)