Continental drift is the geological phenomenon in which continents move. These movements at speeds of a few centimeters per year can actually be measured since the advent of satellite geodesy. The movement of continents is caused by plate tectonics.
Alfred Wegener noted at the beginning of the 20th century that the edges of some continents (particularly South America and Africa) are similar in shape, concluding that the continents were connected and separated before. The problem was that it was not known how huge land masses could move across the Earth's surface. Such a movement requires enormous power and it was not known where it came from.
Later it was known that, according to plate tectonics, the continents move as a result of convection currents in the mantle. They slowly move away from each other, bump into each other, slide under each other, or rub against each other. This causes various surface phenomena, such as earthquakes, volcanism, and slow changes, such as subsidence, mountain building and the displacement of continents.
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Answer:
Structural Theory
Explanation:
Structural -Theory is a school of thoughts in sociology that views society as a complex system, with a focus on solidarity, support and stability.
Answer:A heuristic
Explanation:
A heuristic technique is the way in which we use a short cut to solve a problem or to make a decision by using practical reasoning which may not be logical or rational but still which is sufficient for us to make a quick decision or resolve an issues immediately or reach a short term goal. It helps us find a satisfying solution as quickly as possible.bit take away all the process of having to think deep. Heuristic can be a trial and error or an educated guess or using Intuition or just plainly common sense.
Answer:
D
Launching material on a space shuttle costs about 20 million dollars per ton.
Explanation:
Answer: Permanent magnets have their atoms aligned all the time. Temporary magnets have their atoms aligned only while under the influence of a strong external magnetic field. Overheating a permanent magnet will rearrange its atomic structure and turn it into a temporary magnet.
Word cited: https://sciencing.com/difference-permanent-magnet-temporary-magnet-8180685.html
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