No puedo ayudas porque no soy un estudiante en tu escuela :( lo siento y buena suerte!
The answer is c. anything made by humans, as opposed to things made by nature.
Hi there
<span>A catastrophism is a geological doctrine that changes in the earth's crust have in
the past been brought about suddenly by physical forces operating in
ways that cannot be observed today.
I hope that's help!
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35 parts per thousand
Sea water. Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of approximately 3.5%, or 35 parts per thousand. This means that for every 1 litre (1000 mL) of seawater there are 35 grams of salts (mostly, but not entirely, sodium chloride) dissolved in it.