Why does plastic flow only occur below 50 meters of ice? A. It is cold enough below that much ice to cause plastic flow OB. Fifty meters of ice can block enough sun to cause plastic flow C. It takes the weight of that much ice to cause the plastic flow O Basal slip only occurs at depths below 50 meters.

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane