Magma forms at mid-ocean ridges through a process called seafloor spreading, which happens when tectonic plates diverge and upwelling currents in the mantle push up molten rock to fill the gap. In contrast, at convergent plate boundaries, magma forms through the subduction and melting of a tectonic plate as it is forced beneath another.
At mid-ocean ridges, tectonic plates move apart from each other, forming a rift. Here, upwelling currents in the mantle cause molten rock, or magma, to rise and fill the space between the separating plates, forming basaltic lava. This process, known as seafloor spreading, results in the creation of new sea floor and undersea mountain ranges.
Conversely, magma production at convergent plate boundaries or subduction zones is different. This occurs when tectonic plates collide, and one plate is forced beneath the other. The subducting plate is thrust into the high-pressure and high-temperature conditions of the upper mantle, causing it to melt and form magma. This magma can rise to Earth's surface, resulting in volcanic activity.
In summary, the creation of magma at mid-ocean ridges is caused by the divergence of tectonic plates and upwelling in the mantle, while at convergent plate boundaries, magma forms through subduction and melting of tectonic plates.
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B.uplifting
C.divergent
D.convergent
Electromagnetic Spectrum.
In the short-term, The French-Indian War or The Seven Years War expanded the British colonial territory in North America by an enormous amount and removed potential competitors in early westward expansion. In the long-term, it resulted in extreme national debt in Britain, bringing about dictatorial control of its colonies so it could alleviate economic stress. First came the passing of the Proclamation of 1763, which stopped all westward movement by its American colonies past the Appalachian Mountains (they hoped to make Native Americans and the Spanish buy land), then several new Acts like the Stamp Act were passed which taxed goods like paper, and eventually, as some historians interpret, led to the American Revolution.
True
B.
False
The given statement "another name for lines of longitude is meridians" is true as it is used to determine locations. The right answer is A.
Meridians are imaginary lines that run from the North Pole to the South Pole and are used to measure the east-west position of a location on the Earth's surface. They are perpendicular to lines of latitude and help establish a global coordinate system for navigation and timekeeping.
They serve as a crucial component of the geographic coordinate system, used to determine the east-west position of any location on the Earth's surface. Meridians are essential for navigation, cartography, and establishing time zones, helping us understand the global distribution of time and geographical locations.
The correct answer is option A.
Know more about meridians here
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