Match each feature created by erosion to the correct description

| a channel of connected grooves created by

runoff

stream

one of many channels that connect to form a

river

tributary

a small groove in soil created by runoff

gully

CH

a series of connected channels that fills with

water

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?