Which of these processes involve separation of grains? A)Tilling
B)burrowing action of earthworm
C)Levelling
D)Both a nd b

How does the release of trapped gases in magma cause a volcano to erupt? a. they push the magma up the pipe and then are reabsorbed into the magma chamber. b. they cause the magma to change chemically into lava. c. the gases form vents that allow the magma to flow out. d. the gases rush out and carry the magma with them.

Number and variety of living organism; includes genetic, species, and ecological types

This is collection of data made by comparing objects in standard units. in science, the units are metric.