Answer:
vertical and horizontal symmetry
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The connection between the plate boundaries and the volcanoes lies in that that they are both part of the geological activity on the planet, and that they are both found on roughly the same places.
On the places where there's plate boundaries, apart from the continental-continental convergent plate boundaries, there's a lot of geological activity. There's cracks that form through the crust, extremely high pressures, adjustments of rocks inside the crust, opining gaps between two plates. That leads to suitable conditions for the high pressure of the mantle layer to be able to push upwards the magma through this places. The magma is very hot, and supported by the high pressure from bellow, it manages to reach the surface relatively easily. Once the magma reaches the surface, it starts to lift up the surrounding area, forming a cone shaped feature, and once the crust is not able to stretch anymore, the magma breaks through it and in the form of lava comes on the surface, forming new crust. If we take a map where the volcanoes and the plate boundaries are marked, we can easily see that their locations correspond, expect for the volcanoes on Hawaii which are formed because of a hot spot.
Answer:
As it is a cold current, except at times of the phenomenon known as El Niño (q.v.), the Peru Current brings fog to the nearby coast but also helps to keep the coast one of the most intensely arid areas in the world. The cold flow is intensified by upwelling of deep water caused by the combined effects of the drag of surface winds of the Southeast Trades and the Earth’s rotation. Upwelling brings abundant nutrients close to the surface, and the beneficial effects of sunlight, which allow for rich plankton growth, make the waters off Peru, Chile, and Ecuador one of the world’s greatest fishing grounds for anchovies and the larger fish (e.g., tuna) that feed upon them. Another economic benefit is the guano, used for fertilizer, deposited by the flocks of birds that feed on the anchovies.
The current’s alternative name is taken from that of the German scientist Alexander von Humboldt, who in 1802 took measurements that showed the coldness of the flow in relation to the air above it and the sea around it.
A star spends most of its life as B, a main sequence star.