Why is the C-14/C-12 ratio used to date once-living organisms? O A. The amount of C-12 changes when an organism dies.
O B. An organism stops taking in carbon when it dies.
O C. C-12 becomes radioactive when an organism dies.
O D. The half-life of C-14 changes when an organism dies.

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

How do temperature and salinity affect deepwater currents? as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.