The earth's biosphere is consists of a. the part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life. b. only the water on earth that is in its solid form. c. the solid part of the earth consisting of the crust and outer mantle. d. all of the earth's water, including surface water, groundwater, snowcover, ice, and water in the atmosphere.

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.

Why is carbon ideal for making different compounds?

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.