Which of the following constructive forces was most powerful in the formation of the appalachian mountains? a. crustal deformation due to two tectonic plates moving apart b. crustal deformation due to two tectonic plates moving together c. crustal deformation of two tectonic plates sliding next to each other d. crustal deformation did not play a role in the building of the appalachian mountains

Option (B)

Explanation:

The Appalachian mountains are one of the oldest mountain belts that have formed during the time of Ordovician, which is about 460-480 million years back. During this time, the super continent Pangaea was present, within which the Appalachians mountains were formed due to the convergent of the North American plate and the North African plate. But in due course of time, the direction of plate motion has changed. As a result of which these two plates moved in the opposite direction creating the Atlantic ocean.

Thus, the Appalachian orogeny was formed due to the collision between two continental plates namely the North American plate and the North African plate.

Hence, the correct answer is option (B).

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

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