, proposed the theory of which suggested the continents move and started out in different positions from what they are currently. In the 1960s, scientists discovered the spreading apart of . This in turn led to the theory of . This theory says that the is made of plates which float on a "plasticlike" undersurface called the asthenosphere. Where these plates come together at their, changes take place in the crust and its feature.

Alfred Wegner proposed the theory of Continental drift which suggested the continents move and started out in different positions from what they are currently. In the 1960s, scientists discovered the spreading apart of the seafloor. This in turn led to the theory of Plate tectonics. This theory says that the earth's outer crust, the lithosphere is made of plates which float on a "plasticlike" undersurface called the asthenosphere. Where these plates come together at their boundaries, changes take place in the crust and its feature.

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Alfred Wegner proposed the theory of Continental drift which suggested the continents all continents were once connected in a large single mass that broke apart around 200 million years ago before slowly moving apart to where they are currently.

In the 1960s, Harry Hess, a geologist and Navy submarine commander during World War II, discovered the spreading apart of the seafloor. This in turn led to the theory of Plate tectonics. This theory says that the earth's outer crust, the lithosphere is made of plates which float on a "plasticlike" undersurface called the asthenosphere. Where these plates come together at their boundaries, changes take place in the crust and its feature.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

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