It is because of subduction<span>: oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper </span><span>mantle </span><span>(subduction). This is like a giant recycling system for oceanic lithosphere! Because continental crust is lighter than oceanic crust, continental crust cannot subduct. We therefore still have some very </span>old continental rocks<span> at the surface of the Earth.</span>
Answer:
Galveston built a massive seawall to turn back storm-generated waves.
Explanation:
C. Discovering vaccination and microbial fermentation
A microbiologist who discovered microorganisms cause fermentation. Eg. leading to food spoilage
The parliament started imposing heavy taxes on the colonies to pay British War Debts
Explanation:
After the battle of Seven Year’ war, British expelled France. British faced huge war debts in order to fund the army and provide subsidies to its allies. British started to tax the people of its own country and this huge burden of taxes was not accepted by the people and they fell on streets and protested the crown. British felt that any further burden of taxes would annoy the people of home land and hence decided to burden the colonial people in America.
Before the seven year’ war most of the American colonies contributed to the British Revenue but after the war, British started to burden them with heavy taxes which annoyed the American colonists. American colonists asked for representation in the parliament so that it would enable the crown to listen to their grievances but they were turned down. This annoyed the colonists drastically and they began to protest which paved way for the American independence.
