WORDS FOR THINGS Answer each question with a COMPLETE answer. Which force always opposes forward motion, and is usually affected by gravity pulling the two objects
together, and is the main reason objects decelerate on earth?
Which force always opposes forward motion, and is usually affected by gravity pulling the two objects together, and is the main reason objects decelerate on earth?

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.

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Define a is a tiny pavket of energy