Deltas are built up by
a. deposition.
b. leaching.
c. abrasion.
d. erosion.

Which characteristics of temperature and salinity have the greatest influence on the movement of deep-ocean currentsa. warm and low salinityb. cold and high salinityc. cold and low salinityd. warm and high salinity

Which is not a cash crop grown in the high islands of melanesia and polynesia? d. rubber c. coffee b. sugar cane a. kiwifruit

What are cutting "steps" or terraces