<u>The Continental drift</u> is the displacement of continental masses relative to each other. This hypothesis was developed in 1912 by Alfred Wegener, who affirmed <u>that thousands of years ago there was a single and unique supercontinent, called </u><u>Pangea</u><u>, which later became separated.
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His formulations were based mainly on the way in which the forms of the continents seem to fit on each side of the Atlantic Ocean, such as Africa and South America. He also took into account the distribution of certain fossils that coincided in continents far from each other.
<h2>At first this approach was discarded by most of his colleagues, because <u>his theory lacked a logical and geological explanation for its epoch. </u></h2><h2></h2>
He proposed that the continents move on another denser layer of the Earth that made up the ocean floor. But it was not until the 1960s, with the development of the theory of tectonic plates, that the movement of the continents could be adequately explained.
Because Alfred Wegener was unable to explain the mechanism behind the drifting of the continents
Explanation:
Alfred Wegener was the first person to discover the concept of continental drift. He proposed various evidences in support of the continental drift theory. This includes the following-
presence of similar fossil assemblages in different distant continents.
matching of the continental margins
presence of similar rock sequences, in the continental edges
But the main mechanism behind the continental motion was not explained by him. So, most of the geologists did not accept the continental drift theory.
Later, with the modification, the plate tectonic theory was developed that provided the main mechanism for the plate mechanism. The main mechanism here is the convection current that forms in the mantle.
March equinox is day during the year when all the daylight of the sun is asme at sunrise and sunset.
Explanation:
Equinox is the time when the plane of the earth passes through the centre of the sun. Occurring around 23 March and 23 Sept. The vernal equinox is also called as the spring equinox.
The azimuth of the sun is the angle of the sun's position defined by the relative direction along the horizon. However the most commonly followed convection for analyzing the sun radiation is 90 degrees east, south 180 degrees and west is 270 degrees.
As sunrise and sunset are defined by the upper limb of the solar disk. These conditions produce patterns of night and day as the sun appears to move just above the horizon at an angle of 0.39 degrees per day as the equinox passes.
