12. Decide which of the following is the best observation. The dog ate the bone hiding under the tree.

The dog ate the bone hiding.

The dog ate the bone.

The dog ate the bone hiding under the shady tree.

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.

Which piece of equipment would me most useful for measuring the volume of some water? a. pan balance b. graduated cylinder c. tweezers d. flask quick

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver