Calvin is pouring water through a sample of soil, and measuring the amount of time it takes 500 milliliters of water to pass through it.

Soils that allow water to pass through them faster are more .
A.
acidic
B.
fertile
C.
porous
D.
permeable

D

Explanation:

Being permeable means that it is easy for liquids to pass through it.  Liquids, being in this case water, passing through water fast and easy means that the soil is permeable

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.