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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Correct answer choice is :
<h2>A) Former retail centers have been replaced by large malls.</h2><h2 /><h3>Explanation:</h3><h3 />
Before the arrival of the Colonial era in the region which was later called Nigeria, the people were involved in the management of the physical growth of their region, an activity that was defined as traditional establishment plan. Records of the early preachers and explorers showed the presence of cities and towns such as Kano, Zaria, Ibadan, and Oyo in the territory.
I think the correct answer would be A. A normal cultural characteristic of rural areas would be having strong family values. Rural areas are areas where there are few homes and infrastructures and the distance for each buildings are more or less far from each other. This would mean that families tend to be more close to each since they are able to communicate to each other frequently.
The correct answer is letter B. Horizontal water movements. Upwelling is a phenomenon that involves the dense's motion because of the wind. It is cooler and makes the water rich in nutrients towards the ocean surface. The warmer air is replaced and nutrient-depleted surface water are also replaced. This makes increase in plankton population and increase in nutrients at the ocean surface. The movement of the water is vertically up.
