It can be one of two things.
First, it can be due to global warming.
Second, it can be due to the rotation of the sun. When the sun rotates, it can change it latitude causing it to hit at different points onto different areas of the world.
The convection cell in the mantle is essentially the self-sustaining, constant movement of the magma inside this layer. This works in a very simple way. The hotter magma is less dense, so it is pushed upward toward the crust above it, while the cooler magma is denser, and it moves downward where it gets hotter, and the process goes on and one. The magma that goes upward toward the crust, manages to push through the thinner and cracked crust between the plates that move away from each other, thus on the divergent plate boundaries. As the magma penetrates through the crust it manages to get to the ocean floor, thus causing volcanic activity. This magma cools of very quickly and creates new crust. Because the magma constantly rises up and creates new crust, the crust piles up and forms an underwater mountain of volcanic origin that constantly has volcanic activity because of the rising magma. This volcanic underwater mountain range is called mid-ocean ridge.
In the age of exploration.... Prince Henry showed the Portuguese how to navigate by studying the sun and stars until later on, he showed them the compass navigation as the only technology advance which made possible for them.
The Canadian province that did not ratify the Canadian constitution act after Canada gained complete independence was Quebec. Historically Quebec has been a French territory, unlike the other Canadian provinces that were English territories. The different backgrounds, relations and cultural differences, as well as Quebec's ambition to become a separate country, were all reasons for this province to not ratify the Canadian constitution act.
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