Metamorphic rocks are common when two continental plates collide because A. Magma bodies are common because there is a lot of melting
B. Sediment buries rocks to increase pressure
C. There is a lot of stress when enormous slabs of crust push together
D. All of these

Which process is involved in growing crops? irrigation transportation recreation condensation

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.

9. the history of life on earth is recorded in