Two processes are described below: process a: rapid moving water strikes a rock on the bottom of a stream and breaks it into pieces process b: glaciers moving along a rocky surface form cracks in the rocks which statement is true about the processes? a. both represent physical weathering. b. both represent chemical weathering. c. process a is physical weathering and process b is chemical weathering. d. process a is chemical weathering and process b is physical weathering.

Type the letter that represents the correct location for each particle type below.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.