Answer:
The crust broke up because of the convection currents, formed tectonic plates, and is slowly pushed on the surface until it collides with another plate and subducts.
Explanation:
This image gives us the basics of how the plate tectonics theory works. The material in the upper mantle is cooler and denser than the material in the lower mantle, so it drops down and it pushes the hotter and less dense material up. This creates a circular motion in the mantle, and this motion creates enormous pressure on the crust above it and breaks it up.
As the crust is broken up, magma is rising constantly for millions of years, so the new magma pushes the old solidified one further away. This also pushes two pieces of crust away from each other. As the crusts move away, they eventually collide with another plate, and either gradually merge with it, or a subduction zone is created. In the latter, the crust moves below another crust and into the mantle, where it gets melted and recycled.
Explanation:
The growth in urban areas comes from both the increase in migration to the cities and the fertility of urban populations. ... Therefore, the urbanization of the world is likely to slow population growth. It is also likely to concentrate some environmental effects geographically.
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In a river, sand would most likely be carried by suspension.
Suspension is one of the 4 main processes of transportation in the river.
Suspension happens when materials made up of very fine particles like clay or silt are carried or lifted as a result of the turbulent current in the river. Rivers that are fast-flowing and highly turbulent carry more suspended materials. One of these suspended materials is sand.
The fundamental goals of the revolution were incorporated in the 1917 constitution, although widespread factional fighting continued until 1920. The revolution set in motion a trend toward political centralization, concentrating power in the national government and particularly in the president. The role of the military in politics was substantially reduced by a series of revolutionary presidents, even though all the presidents who served between 1920 and 1946 had been revolutionary generals.
The revolution also launched labor and social reforms that have had a lasting effect on Mexican society.
