Answer:
Oil Sand is also known as Tar Sands. Oil sand is a mixture of sand, clay, water, and a substance called bitumen.
Explanation:
Some of the disadvantages of tar sand are
- Extracting bitumen from tar sands is carbon-intensive.
- Leaks from tar sands operations could harm people and animals in the region.
- Clear-cutting is often required to access deposits.
Some of the advantages of tar sand are
- It provides a localized economic benefit.
- It is a secure source of energy.
- Environmental changes can be repaired.
- Recipients of tar sands experience economic benefits.
Open pit mines are used to collect clay.
What is surface mining?
Almost all mining ventures involve some form of surface mining. Surface mining is the process of removing the top layer of the ground to obtain the minerals below. Surface mining is specifically used to recover materials like sand, gravel, stones, coal, iron, and other metals.
Types of surface mining:
1.Mining in Open Pits
- Similar to strip mining, open-pit mining involves extracting ore from an open pit that isn't then filled in. Ancient civilizations including the Greeks, Romans, and Persians engaged in open-pit mining for salt, granite, and marble for ages.
- When open-pit mines generate building materials like marble, granite, and limestone, they are generally referred to as quarries.
2.Extensive Mining
- A "highwall," or an unmined wall with overburden and exposed minerals and ores, is used in highwall mining to collect the ore.
- Highwalls are typically found at the edges of quarries and pit mines, allowing miners to access ore that would otherwise be too expensive to remove overburden from.
3.Dredging
- The more complex variation of panning for gold is dredging. In actuality, it's primarily connected to gold mining.
- Moving up a water table are floating dredges, which are barges equipped with conveyor belts and scoops, much like hopeful miners with their pans during the gold rush.
4.Removal of Mountains
- Mountaintop removal mining, which is hotly debated, is best suited for removing significant quantities of minerals from mountain summits, typically coal.
- The procedure entails using explosives to blast the overburden above the desired mineral seam.
Thus, open pits mining is used to collect clay
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The correct answers are:
- <em>is the innermost layer;</em>
The troposphere is the first layer of the Earth's atmosphere, thus it is the innermost one of all. This is the layer which enables life on our planet, and its composition is just the right one that life on Earth can thrive.
- <em>has the highest air pressure;</em>
Because this layer has the biggest density of all layers, which practically means that it has the most molecules per area, so it is the richest with gasses, this layer has the highest air pressure. The more gasses there are in a layer, the heavier it is, thus it has bigger air pressure.
Answer:b. oceanic crust to continental crust collision
Explanation: Oceanic plates are heavier than continental plates. When they collided the oceanic plate went down.