Which of the following best describes the changes involved in a fission reaction? the nucleus of an atom splits into fragments, releasing a large amount of energy. the nucleus of an atom splits into fragments, absorbing a large amount of energy. the nuclei of two small atoms combine to form one larger nucleus, releasing a large amount of energy. the nuclei of two small atoms combine to form one larger nucleus, absorbing a large amount of energy.

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 position represents spring in the southern hemisphere? a) b) c) d)

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit