Because nearly all of the crops or livestock raised are used to maintain the farmer and the farmer’s family, leaving little, if any, surplus for sale or trade. Preindustrial agricultural peoples throughout the world have traditionally practiced subsistence farming. Some of these peoples moved from site to site as they exhausted the soil at each location. As urban centres grew, agricultural production became more specialized and commercial farming developed, with farmers producing a sizable surplus of certain crops, which they traded for manufactured goods or sold for cash.
The occurrence of high-heat flows at the ridge center provides evidence of the existence of rising mantle convection currents.
The solid silicate mantle of Earth moves very slowly as a result of convection currents that transfer heat from the planet's interior to its surface. This process is known as mantle convection. The asthenosphere and the lithosphere at the surface of the Earth together make up the upper mantle.Convection currents develop in the mantle as a result of heat from the core and the mantle itself. Mantle material rises in hot columns slowly. The hotter material spreads out toward the top of the asthenosphere and pushes the colder stuff aside. This cooler substance returns to the mantle.
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The form of energy would be C)Geothermal energy. Geothermal energy is heat within the earth so people can use this heat as steam or hot water to heat buildings and generate electricity
Answer:
It is formed on earths surface because igneous rock is formed by volcanoes and volcanoes are on land
Explanation:
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