What term describes physical weathering due to collisions between sand and sediment carried in moving water and the rock surface over which the water flows.

-erosion
-abrasion
-dissolving
-wedging

What element is able to combine with itself and hydrogen to form large molecules ?

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources