Which of the following statements describes rill erosion?

2 answers:

5 0

The statements that describes rill erosion is Running water cuts small channels into a slope. The answer is letter D. The population increases next to a shoreline, sand along a shoreline is repeatedly picked up by waves and sediment is deposited by a river o not answer the question above.

velikii [3]2 years ago

5 0

The correct answer is:

D. Running water cuts small channels into a slope.

Explanation:

Rill erosion is the replacement of soil by intensive water running through tiny streamlets or headcuts. Detachment in a rill happens if the sediment in the flow is under the outlay the load can transport and if the flow distances the soil's resistance to impartiality.

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An element has a half-life of 30 years. If you start with 10g of this element, how many grams of this element would remain after

drek231 [11]

After two half-lives or 60 years, 7.5 g of the element will be left.

Explanation:

Half-life:

In simple words, Half-life can be defined as the amount of time needed for a quantity to fall to half its value as contained at the beginning of the time period.
In this problem the half-life of the element is thirty years, then after thirty years half of the sample would have decayed and half would be left as it is.
After thirty years (The first half-life ) 30 /2 = 15 g declines and 15 g remains disappeared.
And after another sixty years (The two half-lives) 15 /2 = 7.5 g declines and 7.5 g remains disappeared.
After two half-lives or 60 years, 7.5 g of the element will be left.