The heat that remains inside the Earth from its creation and radioactive decay are its main heat sources.
The deep earth receives heat from three main sources: (1) heat left over from the planet's formation and accretion, (2) frictional heating brought on by denser core material sinking to the planet's centre, and (3) heat from radioactive element decay.
The energy produced when unstable atoms decay is known as radioactivity, and it is a substantial contributor to the Earth's heat. The main source are the radioactive isotopes of uranium-235 (235U), uranium-238 (238U), potassium-40 (40K), and thorium-232 (232Th) in the Earth's mantle.
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<em>Hurricane Maria left Puerto Rico without clean food and water for more than 6 months, leaving people to deal with crippling emotional damage, and having to evacuate people from their homes. Maria made landfall on Puerto Rico on September 20 at high-end Category 4 status, bringing a large storm surge, very heavy rains, and wind gusts well above 100 mph (160 km/h), flattening neighborhoods and crippling the island's power grid. When Hurricane Maria struck Dominica in September 2019, more than 90 percent of the island's structures were destroyed and leaves were ripped from trees. Today, the people of Dominica are rebuilding with the knowledge that climate change could mean a future of storms like Maria.</em>
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Similarities :Both alluvial fans and deltas deposit sediment.
Difference:
A delta forms when a river empties into a larger body of water. An alluvial fan forms on land where a river emerges from a mountainous area and flows out onto a more gently sloping plain. The decrease in slope causes the river to decelerate and deposit sediment, forming an alluvial fan.
A good example of a centripetal force in political geography is: A powerful external threat.
Political geography can be defined as a subfield in geography that is focused on the study of boundaries, human government, divisions, and possessions of a nation, as well as outcomes of political processes in its states.
In Political geography, a centripetal force refers to the attitude that unifies the people living within a nation and it keep the nation together by stabilizing and strengthening it.
Basically, two good examples of a centripetal force in political geography are:
- A powerful external threat.
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Answer:
i think the answer is 90%
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