Which statement is true?
-the earth has a stronger gravitational pull than the sun because it is smaller in mass.
-planets would travel in a straight line if it weren't for the force of the sun's gravity.
-the sun's gravitational pull is weaker on planets that are closer to it.
-the elliptical path of planets is described by newton's 1st law of motion.

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? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.