The lithospheric plates move relative to each other. They are created at mid-oceanic ridges and destroyed at subduction zones. A mid-ocean ridge is an underwater mountain system formed by plate tectonics. It consists of various mountains linked in chains, typically having a valley known as a rift running along its spine. This type of oceanic mountain ridge is characteristic of what is known as an oceanic spreading center, which is responsible for seafloor spreading. The production of new seafloor results from mantle upwelling in response to plate spreading; this isentropic upwelling solid mantle material eventually exceeds the solidus and melts. The buoyant melt rises as magma at a linear weakness in the oceanic crust, and emerge as lava, creating new crust upon cooling. A mid-ocean ridge demarcates the boundary between two tectonic plates, and consequently is termed a divergent plate boundary.
Answer:
This fundamental structural unit consists of a silicon cation (black in photo) surrounded by four oxygen anions (red in photo), giving it four negative charges. It is found in all silicate minerals (ie. amphibole, olivine, pyroxene, quartz, feldspar, etc.). The silica tetrahedra may be arranged in chains (ex: pyroxenes), double chains (ex. amphiboles), sheets (ex: micas), and frameworks (ex: quartz, feldspars), forming the basic structure of the planet.
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Answer:
A - The Democratic Republic of the Congo
Explanation:
Modern day DRC looks similar to the yellow highlighted. All the other countries do not match up with those borders.
Answer:
People choose to settle along the coast because the interior of these countries is not suitable for life.
Explanation:
The countries in Northern Africa like Libya, Morocco, Algeria, and Tunisia, have almost all of their populations settled along or very near the coastlines. There are slight variations among the population patterns in these countries, but the general rule, except in Morocco, is that the interiors have little to no population and settlements.
The reason for this is very simple, lack of living conditions in the interior. While the coastline has multiple benefits for the people, like Mediterranean climate, patches of good soil, access to sea, easy movement of goods and people, the interior is the total opposite. The inteior is a hot desert, part of the Sahara Desert. There is little to no water, no soil, no sources of food, little to no natural resources, no infrastructre, and very dangerous sandstorms.
The answer I think it is A and C