Question

which describes the greenhouse effect?
○ an artificial process
○ a dangerous process
○ a natural process
○ a new process

Explanation:

The greenhouse effect is a natural process where certain gases in Earth's atmosphere (like carbon dioxide, methane) trap heat from the sun, helping to warm the planet to a temperature suitable for life. It is not artificial (has existed naturally), not inherently "dangerous" in its natural form (though human - induced enhanced greenhouse effect is a problem), and not a new process (has been occurring for a long time). So the correct description is a natural process.

Answer:

C. a natural process