It is soil that has been washed into the river from the riverbank or from the nearby fields.Components of SoilSoil is made up of a number of layers (层) , each having its own distinctive colour and texture. The upper layer is known as the litter. It acts like a blanket,limiting ...
Why does the Earth have seasons, according to astronomy? Why does the sun rise in the east and set in the west? Why are coral reefs located near the equator? Why is the Antarctic Circle important? Why did they rename the Antarctic Ocean?
future will be able to examine the sediment being laid down today. Whereas right now we can say that yes, human impact on the Earth is clear,it'll be future researchers who'll have a better perspective and will be able to really draw a line between the Holocene and the Anthropocene ...
Why do igneous rocks have holes? Why isn't the Earth's entire mantle liquid? Why do minerals in metamorphic rocks often rearrange in layers? How does the mantle affect the Earth? Why is the crust the thinnest layer of Earth? Why is diamond brittle, even though it is the hardest substanc...
As far as the extraction process the petroleum industry digs deep wells to reach underground oil fields where crude oil has accumulated over a large area and is trapped between layers of rocks. Then it pumps the crude oil out. Then its refineries have two main tasks, convert less valuable cr...
Numerous other evidences for an old earth have been observed by scientists over the past two hundred years. These include fossil soils, and massive deposits of salt and of limestone in the midst of sedimentary rock layers, and tens of thousands of annual layers in lake bottom deposits (“varve...
Evolution is driven by interactions between genetics and nature, and the Earth's rock layers preserve a record of this process. By studying fossilized remains, scientists can learn about how modern animals evolved. But how these animals came to live where they live, look the way they ...
Of the total amount of the sun's energy that reaches the Earth, 30% is reflected back into space by clouds and the Earth's surface. The atmosphere absorbs 19%. Only 51% is absorbed by the Earth's surface. We are not normally aware of it but air does have weight. The column of ai...
Male Professor: Great analogy. And now you can see why we don't have an exact date for our sculpture “The Lady with the Hood.” 6.Why does the professor say this: A. To make the point that written records are not important.
Crude oil is a naturally occurring liquid petroleum product composed of hydrocarbon deposits and other organic materials formed from the remains of animals and plants that lived millions of years ago. These organisms were covered by layers of sand, silt, and rock, subject to heat and pressure, ...