-Mountains provide us with freshwater, energy, food, biodiversity, and medicinal products – resources that may become very rare in the coming decades. They are also very prone to climate changes, land degradation, deforestation and natural disasters.
I only photographed my textbook but this page gives a lot of information about your question
The Volga river is the largest river in Europe, so that should be the answer.
C.
EXPLANATION
Mainland Greece is a mountainous land almost completely surrounded by the Mediterranean Sea. Greece has more than 1400 islands. The country has mild winters and long, hot and dry summers. The ancient Greeks were a seafaring people.
-http://www.ancientgreece.co.uk/geography/home_set.html
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Newton's 2nd law of motion says: <u>Force= (mass) x (acceleration)</u>
You know the force and the mass, and you need to find the acceleration.
So divide each side of the formula by (mass).
Then you have:
(force) / (mass) = acceleration .
Write the quantities that you know in their places,
and bada-bing, out falls the answer you need.