The shockwave from an undersea earthquake causes 'ripples' in the ocean which are very large swells. When the bottom of the swell touches land, it must build up higher to maintain it's size. Therefore when it approaches the beach, water is drawn away from the beach to compensate for the ocean depth getting shallower under the tsunami swell. More water is drawn from in front of the swell than behind due to the movement of the swell.
1.D
2.F
3.E
4.A
5.C
6.B
Hope this helps!!!!
Solution :
The type of melting that is responsible for the mafic magmas for the following plate tectonic settings :
a). Mid - ocean ridges
At the mid oceanic ridges, the two plates diverges away and the new oceanic crust is formed by the effusion of the magma. The earth's interior is exposed as the two plates are moved away.
b). Continental rift :
A new oceanic crust is formed by the effusion of the magma and the two plates diverges away. Thus it causes the formation of the melt in the continental drift. As a result, the crustal thickness decreases.
c). Oceanic and continental volcanic arc :
The oceanic arc and the volcanic arc are the locations of the convergence. The denser plate of the arcs subducts under the less denser plates or the lighter plates and it moves downwards into the mantle, which causes the increase in temperature of the surroundings.
Answer:
Option (A)
Explanation:
The horizon is usually defined as the place where both the sky and ground meets. If the height of the observer is higher, then the horizon becomes more lower and distance increases from the observer to the visible horizon.
The line of horizon is often concealed by the presence of trees, buildings and houses, mountains and land areas.
There are mainly two types of horizon namely, the true horizon and the visible horizon.
Thus, the correct answer is option (A).
Most divergenr boundaries occur along the mid ocean ridges where sea floor spreading occurs. divergent boundaries also occur on land. When a divergent boundary develops on land, two of earth's plates slide apart. A deep valley called a rift valley form along the divergent boundary.
