Answer:
Because the main mechanism was not explained by Alfred Wegener
Explanation:
Plate tectonics was initially known as the continental drift theory and it was introduced by Mr. Alfred Wegener. He described that the continents moved over the large ocean from one place to another. He contributed many pieces of evidence in support of this theory, such as similar fossil assemblages, similar rock types that are found in distant continents, and matching of the continental margins.
But he was not able to explain the main mechanism behind this continental motion, due to which this theory was initially not accepted.
Later, this theory was modified and named as the plate tectonic theory which was widely accepted in the 1960s, where they found that the main mechanism for the plate motion is the convection current that forms in the mantle.
Social media and mobile devices may lead to psychological and physical issues, such as eyestrain and difficulty focusing on important tasks. They may also contribute to more serious health conditions, such as depression. The overuse of technology may have a more significant impact on developing children and teenagers.
The answers are B, C, & F.
A resource is a natural or manmade component that is harnessed by humans for a particular benefit, either subsistent or for enterprise. Examples of resources can be money, nonrenewable resources like crude oil and minerals, and biotic factors such as biodiversity. Energy is the most commonly used resources as it powers the global economies. People are also distributed across the globe according to the availability of resources. The more the resources, the higher the density of people in a region.
