Which element above has 15 protons in its nucleus?

A. oxygen

B. carbon

C. phosphorus

D. sulfur

Why do you think glass bottles keep water cold longer?

Hydroelectric power plants can generate huge amounts of electricity. Which of these statements best describes the impact of a hydroelectric power plant on the environment? It pollutes the air. It reduces the level of groundwater.

An ambulance siren sounds different as it approaches you than when when it moves away from you. what scientific term would you use to explain how this happens

An example of a stable ecosystem is a ...

Lori's family is on a road trip. They split their drive into the five legs listed in the table. Find the average velocity for each leg of the trip. Then arrange the legs of the trip from lowest velocity to highest.

If you lived downhill from a volcano and lava started to flow toward your home what could happen?

A battleship simultaneously fires two shells toward two identical enemy ships. One shell hits ship A, which is close by, and the other hits ship B, which is farther away. The two shells are fired at the same speed.

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed for the entire trip. Express your answer using two significant figures.

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 7000 N {/rm N}.

What are the components of earths life support system