Which of the following demonstrates how Earth systems interact over large periods of time and different-sized spaces? A
A mountain range forms over millions of years.
B
A forest fire starts as a result of lightning striking a tree.
C
A rapid landslide causes part of a hill to break off and fall down.
D
A tsunami occurs immediately following an earthquake in the ocean.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.