why is a thin ozone layer over antarctica of particular concern to scientists?


Why is a thin ozone layer over Antarctica Of particular concern to scientists A?

Explanation: Excessive UV-B exposure (if there is too little ozone) causes a variety of deleterious effects on earth life-forms. These effects include severe sunburn and the inducement of cancers.

Why is the ozone depletion over Antarctica?

The Antarctic ozone hole is a thinning or depletion of ozone in the stratosphere over the Antarctic each spring. This damage occurs due to the presence of chlorine and bromine from ozone depleting substances in the stratosphere and the specific meteorological conditions over the Antarctic.

Why is there no mining in Antarctica?

Explanation: Mining in Antarctica prohibited under the Antarctic Treaty, which completely banned it under the Environmental Protocol. … Environmental protection measures were set out under the CRAMRA ban mining. In 1998, it entered into force after France and Australia did not agree on mining in the region.

How much of the world’s freshwater supply Do Antarctica’s ice caps contain?

The Antarctic icecaps contain about 1.56% of the total water on Earth and 61.7% of the Earth’s freshwater. All of Earth’s glaciers and icecaps contribute about 68.7% of the freshwater (middle bar, lower blue portion).

When did scientists discover the ozone hole?

May 16, 1985
In the scientific journal Nature on May 16, 1985, three scientists from the British Antarctic Survey announce their detection of abnormally low levels of ozone over the South Pole.

Why is the hole in the ozone greatest over Antarctica quizlet?

Why is the hole in the ozone greatest over Antarctica? Chlorine freed from CFC’s elsewhere migrate to the Antarctic region, where they are trapped by the polar vortex. Which of the following is true of the ionosphere? The region principally absorbs gamma rays, x-rays, and interacts with the solar wind.

Why is ozone depletion more over the South Pole?

Explanation: The phenomenon of the ozone hole occurred in the Antarctic region primarily due to catalytic breakdown of ozone molecules by halogenated compounds.

Is there gold on Antarctica?

Gold, platinum, copper, iron and coal have also been found in Antarctica. And diamonds are already mined today in some of the world’s colder reaches of northern Canada and Siberia.

What would Antarctica be like without ice?

The weather will be fairly harsh even without the ice (six month “seasons” of summer sun and winter darkness), and Antarctica gets little precipitation, so will be quite dry and arid.

What are the threats to Antarctica?

  • Climate change. Climate change is the greatest long-term threat to the region. …
  • Increased fishing pressure and illegal fishing.
  • Marine pollution. Persistent organic pollutants (POPs) have been measured around Antarctica and detected in wildlife. …
  • Invasive species.

Why is the ice in Antarctica freshwater?

Much of Antarctica is fringed by ice shelves. Ross and Ronne-Filchner ice shelves each have areas greater than the British Isles. Across the base of ice shelves, sea water and ice come into contact. Where this sea water is warm enough, the ice shelf will melt, adding cold fresh water to the sea.

Why is Antarctica the best place to find meteorites?

But in fact, Antarctica is the best place to find meteorites. Its dry, cold climate perfectly preserves the asteroid fragments that make it through the atmosphere and crash on Earth. … And the high-speed Katabatic winds that blow across the surface of the ice help expose still-buried meteorites.

Who owns the Antarctic?

People from all over the world undertake research in Antarctica, but Antarctica is not owned by any one nation. Antarctica is governed internationally through the Antarctic Treaty system. The Antarctic Treaty was signed in 1959 by 12 countries who had scientists in and around Antarctica at the time.

How did scientists discover the hole in the ozone layer?

But in the early 1980s, through a combination of ground-based and satellite measurements, scientists began to realize that Earth’s natural sunscreen was thinning dramatically over the South Pole each spring. This thinning of the ozone layer over Antarctica came to be known as the ozone hole.

Who discovered ozone hole over Antarctica?

The discovery of the Antarctic “ozone hole” by British Antarctic Survey scientists Farman, Gardiner and Shanklin (first reported in a paper in Nature in May 1985) came as a shock to the scientific community, because the observed decline in polar ozone was far larger than anyone had anticipated.

Which of the following scientist founded the ozone layer in laboratory?

Christian Friedrich Schönbein
Ozone is a naturally occurring substance which was first made in the laboratory in 1839 by German scientist Christian Friedrich Schönbein (1840a, 1840b).

Why is ozone depletion greater over the South Pole than the Arctic quizlet?

UV-C radiation is absorbed by which two substances in the stratosphere? Why is ozone depletion greater over the South Pole than the Arctic? The air above the North Pole is not as cold, so that fewer polar stratospheric clouds form. … – Harmful UV radiation could have an effect on the carbon dioxide balance of our planet.

What effect does the ozone layer have on earth quizlet?

Stratospheric ozone filters out most of the sun’s potentially harmful shortwave ultraviolet (UV) radiation. If this ozone becomes depleted, then more UV rays will reach the earth.

What is meant by the hole in the ozone layer quizlet?

Ozone hole. a thinning part of the ozone layer. A chemical reaction caused by CFC’s and other compounds in the atmosphere.

What is ozone layer depletion and its effects?

Ozone layer depletion causes increased UV radiation levels at the Earth’s surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders. … UV rays also affect plant growth, reducing agricultural productivity.

What is special about the South Pole versus the North Pole that leads to ozone depletion only at the South Pole?

What is special about the South Pole versus the North Pole that leads to ozone depletion only at the south Pole? Polar stratospheric clouds form almost exclusively at the South Pole. … Ozone is removed by its reaction with water vapor.

What is ozone layer depletion and its effects Mcq?

​Ozone depletion is the destruction of stratospheric ozone by free radicals like chlorine, bromine when they reach the upper atmosphere. The UV radiations break down the Chlorine molecules into Chlorine atoms.

Can you legally go to Antarctica?

Antarctica is the only continent on Earth without a native human population. … Since no country owns Antarctica, no visa is required to travel there. If you are a citizen of a country that is a signatory of the Antarctic Treaty, you do need to get permission to travel to Antarctica.

Which country is the richest in gold?

China is the number one producer of gold in the world. The USGS estimates that China mined 455 metric tons of gold in 2016. Since gold began to be mined in the 1970s, gold production in China has rapidly increased. China finally overtook South Africa in 2007 as the world’s top gold producer.

Does Antarctica have oil?

There are known reserves of oil and coal as well as mineral deposits in Antarctica, although detailed knowledge of these mineral deposits is sketchy. In the last 50 years of scientific research, no large deposits of mineralized rocks have been found.

What flag is Antarctica?

Antarctica has no universally-recognized flag as the condominium that governs the continent has not yet formally selected one, although some individual Antarctic programs have formally adopted True South as the flag of the continent. Dozens of unofficial designs have also been proposed.

Is there land under Arctic?

There’s no land at the North Pole

Instead it’s all ice that’s floating on top of the Arctic Ocean. Over the past four decades, scientists have seen a steep decline in both the amount and thickness of Arctic sea ice during the summer and winter months.

When was the last ice age?

The glacial periods lasted longer than the interglacial periods. The last glacial period began about 100,000 years ago and lasted until 25,000 years ago.

How does scientific research threaten Antarctica?

Antarctica and its surrounding waters are under pressure from a variety of forces that are already transforming the area, scientists warn. … Visits by tourists, researchers and other people also threaten to change Antarctica, as does the harvesting of animals like krill that are key to the Antarctic food chain.

What kinds of things are scientists studying in Antarctica?

WHAT DO SCIENTISTS STUDY IN ANTARCTICA? Scientists from all over the world visit Antarctica to study the climate, weather, geology, and wildlife of this unique region. Their research has helped to highlight global problems, such as climate change.

Why is global warming a threat to Antarctica?

The warming of the Antarctic Peninsula is causing changes to the physical and living environment of Antarctica. The distribution of penguin colonies has changed as the sea ice conditions alter. Melting of perennial snow and ice covers has resulted in increased colonisation by plants.

What would happen if Greenland melted?

If all the ice covering Antarctica , Greenland, and in mountain glaciers around the world were to melt, sea level would rise about 70 meters (230 feet). The ocean would cover all the coastal cities. And land area would shrink significantly.

When was the last time Antarctica was ice free?

about 34 million years ago
It was ice-free until about 34 million years ago, when it became covered with ice. The lowest natural air temperature ever recorded on Earth was −89.2 °C (−128.6 °F) at the Russian Vostok Station in Antarctica on 21 July 1983.

Is Greenland all ice?

The Greenland Ice Sheet is one of two continent-scale ice masses on Earth, with the other being the Antarctic Ice Sheet. The Greenland Ice Sheet is the largest ice mass in the Northern Hemisphere. … Almost 80% of Greenland’s landmass is covered by the ice sheet, expanding an area over 1.7 million km2.

Why you don’t hear about the ozone layer anymore

Climate 101: Ozone Depletion | National Geographic

Ozone Hole – Why Antarctica?

Why is there a Hole in the Ozone Layer? + more videos | #aumsum #kids #science #education #children

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