Thunderstorms occur as a result of convection in the atmosphere when two air masses that contain different amounts of thermal energy interact. what type of air does cold, dense air often converge with to form a thunderstorm? question 4 options: warmer and more dense air warmer and less dense air colder and less dense air colder and more dense air

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 2 options: 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 cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction

Name three populations commonly found in a prairie system