By moving to coastlands, creating boats and becoming fishermen, the natives of a country with little arable land would be able to make a living and make food without having to work extremely hard to attempt to grow plants.
In the countries with very little arable land forest and woodland make their living by the alternative job apart from farming like, fishing, making boats etc.
<u>EXPLANATION:</u>
The people who lives in these areas move to the coast area and start fishing, making boats for their living.
They do not emphasize more time in land farming or growing crops, instead they utilize the river and aquatic alternative for their living.
North America and the African plates moved away from each other due to the spreading of the Atlantic ocean and the opening of the mid-Atlantic ridge. That develops a diversion motion and separated the plateau in the west and eastern direction. This also leads to the splitting of the south American plate away from the African continent.