A Warning! This page will close automatically if you attempt to open another tab in your browser or another application. Question 13 / 40
When electrons move from a high energy level to a low energy level, which of the following statements are correct?
spectral lines are emitted
mass is converted to energy
the photoelectric effect occurs
quarks combine to create subatomic particle

Define dew point. i am writing this part to be able to ask the question

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

How have the greenhouse gasses increased from the year 2000 to 2018