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.
Answer:
arrangement of population according to geographical structure and physical division is known as population density.....
The correct answer is B Subduction. Subduction is the process by which an oceanic plate gets dragged under another plate and is eventually destroyed in the mantle. Subduction occurs at convergent margins where two oceanic plates collide or an oceanic and Continental plate collide. Oceanic crust is made of mainly of silica and magnesium which is heavier or denser than continental crust which is composed mainly of silica and aluminium.
The subducting plate melts producing excess magma giving rise to volcanoes along these margins.
Bubonic plague effected on European feudalism as it hastened feudalism's decline due to the system's reliance on peasant labor.
Answer: Option A
<u>Explanation:
</u>
Bubonic Plague was an epidemic disease which had spread in Europe in 14th century and resulted in the death of 30-60% of European population. This deadly disease has also resulted in the decline of Feudalism.
The system of feudalism largely dependent of the peasants or labourers which were known as serfs who were employed by the knights and worked under the barons( who worked for the kings).
The Black death or the plague had affected the peasants the most hence breaking the system as the now there was great shortage of labour.
