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olasank [31]
3 years ago
6

How did geologists decide where one division of the geologic time scale ends and the next begins

Geography
1 answer:
iren2701 [21]3 years ago
8 0
<span>Scientists choose where are units of time began and ended based on major changes in life forms at certain times</span>
You might be interested in
Write a paragraph about Natural Recourses of Egypt.
Nostrana [21]

Answer:

Resources and power

Compared with the physical size of the country and the level of its population, Egypt has scanty mineral resources. The search for petroleum began earlier in Egypt than elsewhere in the Middle East, and production on a small scale began as early as 1908, but it was not until the mid-1970s that significant results were achieved, notably in the Gulf of Suez and portions of the Western Desert. By the early 1980s Egypt had become an important oil producer, although total production was relatively small by Middle Eastern standards.

The bulk of Egypt’s petroleum comes from the Morgan, Ramadan, and July fields (both onshore and offshore) in the Gulf of Suez, which are operated by the Gulf of Suez Petroleum Company (commonly known as Gupco), and from the Abū Rudays area of the Sinai on the Gulf of Suez. Egypt also extracts oil from fields at Al-ʿAlamayn (El-Alamein) and Razzāq in the Western Desert. Active drilling for oil, involving several international interests, including those of the United States and several European countries, has continued in both the Eastern and the Western deserts, with marked success during the 1990s and early 21st century.

In the process of searching for oil, some significant natural gas deposits have been located, including substantial deposits in the delta and in the Western Desert, as well as offshore under the Mediterranean Sea. Wells have been established in the Abū Qīr area, northeast of Alexandria. A joint Egyptian-Italian gas discovery was made in the north delta near Abū Māḍī in 1970; this was developed partly to supply a fertilizer plant and partly to fuel the industrial centres in the north and northwest delta. In 1974 Abū Māḍī became the first Egyptian gas field to begin production. Other natural gas fields are located in the Western Desert, the delta, the Mediterranean shelf, and the Gulf of Suez, and by the early 21st century natural gas production had begun to rival that of oil, both as a source for domestic consumption and as a commodity for export.

Egypt has several oil refineries, two of which are located at Suez. The first of Egypt’s twin crude pipelines, linking the Gulf of Suez to the Mediterranean Sea near Alexandria, was opened in 1977. This Suez-Mediterranean pipeline, known as Sumed, has the capacity to transmit some 2.5 million barrels of oil per day. The Sumed pipeline was financed by a consortium of Arab countries, primarily Saudi Arabia, Kuwait, and Egypt. In 1981 a crude oil pipeline was opened to link Raʾs Shukhayr, on the Red Sea coast, with the refinery at Musṭurud, north of Cairo. Additional oil pipelines link Musṭurud with Alexandria, and fields near Hurghada to terminals on the Red Sea.

Several of Egypt’s major known phosphate deposits are mined at Isnā, Ḥamrāwayn, and Safājah. Coal deposits are located in the partially developed Maghārah mines in the Sinai Peninsula. Mines located in the Eastern Desert have been the primary source for manganese production since 1967, and there are also reserves of manganese on the Sinai Peninsula. Iron ore is extracted from deposits at Aswān, and development work has continued at Al-Baḥriyyah Oasis. Chromium, uranium, and gold deposits are also found in the country.

The Nile constitutes an incomparable source of hydroelectric energy. Before the completion of the Aswān High Dam power station in 1970, only a small volume of Egyptian electricity was generated by hydropower, with thermal plants burning diesel fuel or coal being the principal producers. For several years after the High Dam station went into operation, most of the country’s electricity was generated there. Its original 12 turbines have a generating capacity of about 2 million kilowatts; the Aswān II hydroelectric power station (completed 1986) has added another 270,000 kilowatts of capacity to the system. Actual power production from the High Dam has been limited, however, by the need to reconcile demands for power with the demands for irrigation water. Moreover, Egypt’s booming population and growing need for energy has forced the government to construct additional thermal plants, many of them fueled by the country’s abundant reserves of natural gas. Thermal plants now generate some four-fifths of the country’s electricity.

<em>Hope it is helpful for you !!!</em>

6 0
3 years ago
The highest point of the Rocky mountains is about 3 miles high true or false
BARSIC [14]

The statement is - True.


Mount Elbert has an elevation of 4,401 meters (which is almost three miles), and it has a prominence of 2,772 meters. It is the highest summit of the Rocky Mountains of North America. Mount Elbert also represents the highest point of the state of Colorado, and it is also the highest point of the Mississippi River drainage basin which covers 41% of the USA's territory. More specifically this peak is in the Rocky Mountains Range, Sawatch Range, Southern Rocky Mountains Range.

6 0
3 years ago
When analyzing the speeds of stars far from the galactic center, the orbital speeds of stars ___________ as distance increases f
KiRa [710]

Answer: is constant

Explanation:

In order to analyze the velocity of the stars within a galaxy, the <u>galaxy rotation curves</u> (developed by the American astronomer Vera Rubin) are used. These graphs are elaborated as a scatter diagram in which the orbital velocity of the stars present in a galaxy is represented on the Y axis and the distance of these stars to the center of the galaxy on the X axis.

Thanks to this diagram, it has been possible to observe a characteristic behavior in the rotation speed of the stars (and gas) present in the galaxies, which differs from the rules of the orbital movement of the planetary systems postulated by Newton and Kepler.

This means that in these galaxy rotation curves it has been observed that the rotation speed of stars and gas is "constant", regardless of the distance to the center of the galaxy. This discrepancy and these results were then used to demonstrate the existence of dark matter in the universe.

6 0
3 years ago
What has been one major long term effect of the Arab Spring and Arab Winter
SashulF [63]

Answer:

B

Explanation:

The point of the islamic spring was to get rid of the dictaors. Next, there has been huge economic decrease and an increase of terrorist violence.

8 0
2 years ago
Read 2 more answers
Which is an example of a divergent boundary? Great Rift Valley Himalayan Mountains Peru-Chile Trench San Andreas Fault
schepotkina [342]

Answer:

Great Rift Valley

Explanation:

The Great Rift Valley is currently in the process of splitting the African plate into two different plates, and it's a divergent boundary, moving the Somalian, Arabian and Nubian plate away.

Hope this helped!

6 0
3 years ago
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