Question

Identify three ways boundaries are created and provide a specific example of each one

Answer 1

There are three kinds of plate tectonic boundaries: divergent, convergent, and transform plate boundaries.

A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, lava spews from long fissures and geysers spurt superheated water. Frequent earthquakes strike along the rift. Beneath the rift, magma—molten rock—rises from the mantle. It oozes up into the gap and hardens into solid rock, forming new crust on the torn edges of the plates. Magma from the mantle solidifies into basalt, a dark, dense rock that underlies the ocean floor. Thus at divergent boundaries, oceanic crust, made of basalt, is created.

When two plates come together, it is known as a convergent boundary. The impact of the two colliding plates buckles the edge of one or both plates up into a rugged mountain range, and sometimes bends the other down into a deep seafloor trench. A chain of volcanoes often forms parallel to the boundary, to the mountain range, and to the trench. Powerful earthquakes shake a wide area on both sides of the boundary.

If one of the colliding plates is topped with oceanic crust, it is forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into new crust. Magma formed from melting plates solidifies into granite, a light colored, low-density rock that makes up the continents. Thus at convergent boundaries, continental crust, made of granite, is created, and oceanic crust is destroyed.

Two plates sliding past each other forms a transform plate boundary. Natural or human-made structures that cross a transform boundary are offset—split into pieces and carried in opposite directions. Rocks that line the boundary are pulverized as the plates grind along, creating a linear fault valley or undersea canyon. As the plates alternately jam and jump against each other, earthquakes rattle through a wide boundary zone. In contrast to convergent and divergent boundaries, no magma is formed. Thus, crust is cracked and broken at transform margins, but is not created or destroyed.

Answer 2

Answer:

    The concept of limit relates to the idea of ​​division, which many people imagine belongs to the idea of ​​border, which is not correct. The boundary is the division between one territorial unit and another, usually between two countries. The idea of ​​this concept goes back to the constitution of the modern state and its need to determine with complete precision the points of the territory over which it exercises its sovereignty, including its constitutive values, languages, currency, and other aspects. Three types of physical boundaries are: rivers, seas and mountains.

Examples: The physical limits of Europe are:

• Northern Arctic Glacial Ocean
• Mediterranean sea to the south
• Black sea to the south
• Atlantic Ocean to the west
• Ural Mountains to the east
• Ural river to the east
• Caspian Sea to the east

The boundaries between Europe and Asia are unclear, but historical, ethnic and cultural factors give Europe a well-defined individuality. The Russian Federation is the largest country in Europe with 17,075,400 km2, and the most populous with 143.5 million inhabitants. Next comes Germany with 357,120 km2, with a population of 81.89 million.