Which of the following is the best definition of the greenhouse effect? A. Warming of the Earth due to the absorption and recycling of heat by the atmosphere
B. Planting of trees in warmer areas to make them grow faster
C. Convection in the atmosphere to bring heated air to the surface
D. Heating of the ocean and land by radiation

I think it's either A or C, but I'm not sure which one.

Which statement describe events that occur during interphase?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.

What does this experimental investigation lack