I need HELP! Question 1: Which condition helps determine the quality of lake water?

A) the amount of dissolved calcium carbonate

B) the amount of nitrogen

C) the amount of potassium

D) the amount of dissolved oxygen

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 element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Rays from the sun are not considered matter true or false