Which of the following statements about the global phosphorus cycle is true? a) Some phosphorus applied to crops as fertilizer leaves the terrestrial subsystem.
b) The bulk of Earth's phosphorus is found in deep ocean waters.
c) Fertilizers have decreased phosphorus availability in terrestrial ecosystems.
d) The mining of phosphate ore is an insignificant source of phosphorus for fertilizers.

Consider the motion of the balloon and its air contents in terms of momentum. in step 1 above, the total momentum of the balloon and its contents was zero. recall that momentum = mv. both the balloon and the air inside it had a velocity of zero and therefore the total momentum was zero. now think about what happened when the air escaped from the balloon. a certain mass of air accelerated in one direction. in order to keep the total momentum of the system zero, the balloon itself (which has mass) had to accelerate in the opposite direction. use this scenario to you explain why the soda can rotates when the water squirts out of the escape holes. what was your hypothesis concerning the water-filled can? according to your data, do you think your hypothesis was correct? (be sure to refer to your data when answering this question.) summarize any difficulties or problems you had in performing the experiment that might have affected the results. describe how you might change the procedure to avoid these problems. give at least one more example of newton's third law in everyday life.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

What sre the effects of hemolytic disease of a newborn