Answer:
Find the explanation below.
Explanation:
The Yellow River, known as the second-longest river in China and located in its northern part is a beautiful natural endowment cherished by the people in the region but which has been affected by the activities of man. Today, the river is plagued with flooding. Research has shown that man's activities dating to thousands of years ago proved the construction of embankments meant to control the overflow of water from the river. This effort was to have future negative effects.
These levees caused the accumulation of sediments which eventually resulted in flooding. It was also the expansion and intensification of agricultural activities by man that warranted the construction of the levees on this river.
The water cycle — technically known as the hydrological cycle — is the continuous circulation of water within the Earth's hydrosphere, and is driven by solar radiation. This includes the atmosphere, land, surface water and groundwater.
Answer:
The magma that melts in the upper mantle and erupts at the mid-ocean ridge has a different composition (higher in Ca, Mg, Fe and relatively lower in Si and Al) than the composition of the magma (more Si, Al, Na, K rich in relative terms) that built the continents. Melting different degrees (2%, 5%, 30%) of a rock with a mantle-like composition generates magma of different Al, Si contents. Continents grow at their edges by partial melting of oceanic crust that is being subducted, generating magmas of a somewhat more Si, Al-rich composition than the subducting slab itself. The chemistry and physics of melting a mixture of minerals rather than one homogeneous substance has the wonderful outcome of creating two distinct types of crust:
Answer:
If the magma has high gas content and high viscosity, the gas will expand in an explosive fashion and break the liquid into clots that fly through the air and cool along their path through the atmosphere. Alternatively it blast out solid pieces of rock that once formed the volcanic edifice.
Explanation:
When you are researching a topic, the acronym A PACT will help you to remember people, activities, context, and technologies. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
