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The theory of plate tectonics is based on the movement of the tectonic plates by the convection currents, and this has led to the constant change of the physical landscape on Earth.
Explanation:
The theory of plate tectonics suggests that Earth's crust is divided into numerous pieces, called tectonic plates, and they are constantly moving because of the convection currents in the mantle. The convection currents are actually the ones responsible from break up the crust, and they are a circular movement in the mantle, where the cooler and denser material drops down, while the hotter and less dense material is pushed up and creates huge pressure on the crust.
Because of the pressure of the convection currents, the tectonic plates are in constant motion in a certain direction, creating three different types of plate boundaries, convergent, divergent, and transform plate boundaries. The different interactions between the plates have led to the creation or destruction of all sorts of landforms, from mountains and volcanoes, plateaus and valleys, lakes, and ocean basins... The movement of the plates throughout the geological past has led to the formation of supercontinents where the vast majority of Earth's crust has been connected, but also to breaking apart of them and continents scattered around the globe far away from each other.
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Answer:
The states that composed the Central American Federation (also referred to as the Federation of the Centre of America) were the states known today as Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. These areas declared independence from Spain on September 15, 1821. In 1810, the Mexican War of Independence began when Catholic priest Miguel Hidalgo y Costilla proclaimed the Grito de Dolores, which was a call to open revolt. A revolt also broke out among Creole groups in El Salvador in 1811. ... On September 15, 1821, Central America officially gained independence from Spain.
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Answer:
Responses may vary but should include some or all of the following information: Primary-sector jobs are focused on obtaining natural resources or raw materials. Farming, fishing, mining, and logging are primary-sector jobs. Primary-sector jobs turn raw materials or resources into usable finished products. Processing, manufacturing, and construction are secondary-sector jobs. The primary and secondary sectors provide the basics that people need. When there is little technology, it takes a lot of workers to provide these basics. However, as technology improves (e.g. bigger and faster farm equipment and robots in factories), machines do more of the work. It takes fewer and fewer people to produce what is needed from the primary and secondary sectors. The extra workers are now available to take jobs in the tertiary sector, providing more and different services for others.
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