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alexdok [17]
2 years ago
14

How sinkholes are created and from which rock group do they belong to?

Geography
1 answer:
andreyandreev [35.5K]2 years ago
4 0

Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns develop underground.

Sinkholes are formed when the land surface above collapses or sinks into the cavities or when surface material is carried downward into the voids. Drought, along with resulting high groundwater withdrawals, can make conditions favorable for sinkholes to form.

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How has history impacted American culture ?
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identity. The traditions, values, and beliefs held by previous generations hold an indelible impact on how we view our place in the world.

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2 years ago
What are the for stages of a tornado
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6 0
3 years ago
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Knox County is able to draw fresh water from the Lewis and Clark Lake over and over. Describe the possible interactions of Earth
Naddika [18.5K]

Answer:

Erosion has exposed limestone, shale and sandstone geology of the area in the scenic cliffs along the shore of Lewis and Clark Lake SRA, a reservoir on the Missouri River in Knox and Cedar counties.

Environmental science studies the interactions between the physical, chemical, and biological components of the environment, including their effects on all types of organisms. Earth science (also known as geoscience), is an inclusive term for all sciences related to Earth (geology, meteorology, oceanography, etc). Although environmental and earth science cover essentially the same material, environmental science places greater emphasis on the biological realm, while earth science places greater emphasis on the physical realm.

The four spheres are the geosphere (all the rock on Earth), hydrosphere (all the water on Earth), atmosphere (all the gases surrounding Earth), and biosphere (all the living things on Earth).

The spheres interact to effect Earth’s systems and processes, and they are constantly changing each other.

For example, ocean currents (hydrosphere) affect air temperature (atmosphere): The Gulf Stream is a powerful water current in the Atlantic Ocean. It’s warm water moderates the temperatures on the east coast of the USA.

Another example of how the spheres affect each other is through erosion. Erosion happens in the desert when wind (atmosphere) shapes the sand in the geosphere. Water (hydrosphere) can also shape land, such as in the formation of the Grand Canyon.

Explanation:

Lakes and wetlands also have distinctive biogeochemical characteristics with respect to their interaction with ground water. The chemistry of ground water and the direction and magnitude of exchange with surface water significantly affect the input of dissolved chemicals to lakes and wetlands. In general, if lakes and wetlands have little interaction with streams or with ground water, input of dissolved chemicals is mostly from precipitation; therefore, the input of chemicals is minimal. Lakes and wetlands that have a considerable amount of ground-water inflow generally have large inputs of dissolved chemicals. In cases where the input of dissolved nutrients such as phosphorus and nitrogen exceeds the output, primary production by algae and wetland plants is large. When this large amount of plant material dies, oxygen is used in the process of decomposition. In some cases the loss of oxygen from lake water can be large enough to kill fish and other aquatic organisms.

The magnitude of surface-water inflow and outflow also affects the retention of nutrients in wetlands. If lakes or wetlands have no stream outflow, retention of chemicals is high. The tendency to retain nutrients usually is less in wetlands that are flushed substantially by throughflow of surface water. In general, as surface-water inputs increase, wetlands vary from those that strongly retain nutrients to those that both import and export large amounts of nutrients. Furthermore, wetlands commonly have a significant role in altering the chemical form of dissolved constituents. For example, wetlands that have throughflow of surface water tend to retain the chemically oxidized forms and release the chemically reduced forms of metals and nutrients

7 0
3 years ago
What is the summary of the Railway Children story?​
Bess [88]

Answer:

The story concerns a family who move from London to "The Three Chimneys", a house near the railway, after the father, who works at the Foreign Office, is imprisoned after being falsely accused of spying.

Explanation:

The Railway Children is a children's book by Edith Nesbit, originally serialised in The London Magazine during 1905 and first published in book form in 1906. It has been adapted for the screen several times, of which the 1970 film version is the best known. The Oxford Dictionary of National Biography credits Oswald Barron, who had a deep affection for Nesbit, with having provided the plot. The setting is thought to be inspired by Edith's walks to Chelsfield railway station close to where she lived, and her observing the construction of the railway cutting and tunnel between Chelsfield and Knockholt.[1]

Contents

1 Plot summary

2 Characters

3 Adaptations

3.1 BBC radio dramatisations

3.2 BBC television series

3.3 Film

3.4 2000 version

3.5 Stage versions

4 Allegations of plagiarism

5 In popular culture

6 References

7 External links

Plot summary

The story concerns a family who move from London to "The Three Chimneys", a house near the railway, after the father, who works at the Foreign Office, is imprisoned after being falsely accused of spying. The children befriend an Old Gentleman who regularly takes the 9:15 train near their home; he is eventually able to help prove their father's innocence, and the family is reunited. The family takes care of a Russian exile, Mr. Szczepansky, who came to England looking for his family (later located) and Jim, the grandson of the Old Gentleman, who suffers a broken leg in a tunnel.

The theme of an innocent man being falsely imprisoned for espionage and finally vindicated might have been influenced by the Dreyfus Affair, which was a prominent worldwide news item a few years before the book was written. The Russian exile, persecuted by the Tsars for writing "a beautiful book about poor people and how to help them" and subsequently helped by the children, was most likely an amalgam of the real-life dissidents Sergius Stepniak and Peter Kropotkin who were both friends of the author.[2]

The book refers to the then current Russo-Japanese War and to attitudes taken by British people to the war. This dates the setting to the spring, summer and early autumn of 1905, and also accounts for the very hostile opinions of Tsarist Russia expressed in the book.

Characters

Father: A high-ranking civil servant, very intelligent and hard-working, and a devoted husband and father. He is wrongfully imprisoned for espionage, but is eventually exonerated.

Mother: A talented poetess and writer of children's stories. She is devoted to her family, and is always ready to help others in need.

Roberta: Nicknamed "Bobbie", she is the oldest and most mature of the three children, and the closest in personality to their mother.

Peter: The middle-child and only boy. He is intelligent and resourceful, though at times rather insensitive. He considers himself the leader of the three and usually does take the lead in crisis situations.

Phyllis: The youngest and least mature of the children.

Ruth: A servant of the family, dismissed early in the story for her treatment of the children.

Mrs Viney: Housekeeper at The Three Chimneys.

Mrs Ransome: Village postmistress.

Aunt Emma: Mother's elder sister, a governess.

The Old Gentleman: A director of the railway, who befriends Bobbie, Peter and Phyllis and helps when their mother is sick. He is instrumental in freeing Father, and in locating Mr Szczepansky's family. He is the grandfather of Jim.

Albert Perks: The station porter, and a friend of the children. He enjoys their company, but his pride sometimes makes him stuffy with them. He lives with his wife and their three children.

Mrs Perks: Wife of Albert Perks.

Dr Forrest: A country physician.

The Stationmaster: Perks' boss. Rather pompous at times, but has a good heart.

Bill (engineer): An engine driver and friend of the children.

Jim (fireman): Bill's fireman, and a friend of the children. He arranges for one of his relatives to mend Peter's toy locomotive.

The Signalman: Operator of the railway signal box. He has a young child who is sick.

Mr Szczepansky: A dissident Russian intellectual, imprisoned in Siberia for his views, who escapes to England to seek his wife and children.

Bill (bargeman): A barge-master, initially hostile towards the children. He changes his attitude towards them after they save his boat (with his baby son Reginald Horace aboard) from burning.

Bill's Wife: She disapproves of her husband's initial attitude towards the children, and encourages them to fish in the canal while he is not around.

Jim (schoolboy): The grandson of the Old Gentleman, whom the children rescue when he breaks his leg in the railway tunnel during a paper chase.

pls mark me

3 0
3 years ago
Where are the Andes Mountains located?
shtirl [24]
<span>They are located in South America and stretch 4,500 miles from north to south, along the west coast of the continent.</span>
5 0
2 years ago
Read 2 more answers
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