Answer:
B. Aerobic bottom water
D. High organic productivity in the overlying oxygen rich water
Explanation:
A Shale is a sedimentary rock usually formed from silt and clay-size mineral. There are different colors of Shale. The Black Shale is formed under anaerobic conditions. This means that oxygen is deficient in the water where the Shale forms.
A little amount of organic materials is required for the formation of Black Shale and because Black Shale is formed in an environment lacking oxygen, an oxygen-rich water would not be necessary for its growth. Sediments are necessary in the formation of Black Shale.
The area was once a forest.
The area was uplifted.
The area was buried in sediment.
The area was probably covered by water.
Petrification of a dead plant or animal organisms occurs when rock mineral displaces the organic elements in the structure of the biotic matter or these minerals seep in between the spaces and pores within the dead plant or organism and become part of the material.
Explanation:
Petrification occurs under high pressure. This is why this process occurs in the crust after layers of sediments create enough pressure on the dead organic matter buried in with the sediments. This phenomenon commonly begins on the ocean floor where dead marine life sinks to the bottom and is buried by sediments over many years.
Occasionally, tectonic plate forces uplift these petrified fossils from deep in the crust exposing them on the surface like in this case.
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<u>A) Possible trigger for this tsunami:</u>
The reason which might be possible for the tsunami is massive sea waves of water which are resulted from the under sea earthquakes which struck in the gulf of Alaska triggered tsunami.
<u>B) Officials those who doesn’t prepare the public for the possible disaster:</u>
The officials should make the people aware about the disaster and should evacuate the people from that area to avoid any loss of damage to life and property.
<u>C) Is preparations are adequate to prevent a catastrophe for the Pacific Northwest:</u>
No, the state has not done enough to prevent the damage and people are till now building in this potential danger zones.
From 1965 to till the end of the Cold War the US supported Democratic Republic of the Congo ( Zaire ). Mobutu Sese Seko was the military dictator and president of Democratic Republic of the Congo ( which he renamed Zaire in 1971 ). Mobutu was against the USSR foreign policy. His relationship with the US radically changed after the end of the Cold War.
Answer: B. Democratic Republic of the Congo.
The statement that the continental crust is younger than the oceanic crust is completely FALSE. This is because the continental crust is considered to be as old as the Earth itself.
The continental crust is referred to as the portion of the earth covered under land, and that of the oceanic crust is considered to be a part of the area of the earth covered under Oceans.
<h3>Continental Crust</h3>
- The chemical composition of the oceanic crust is different from that of the continental crust, which is a strong evidence to show that the continental crust is older than the oceanic crust.
- The destruction of continental crusts are impossible, and there is often a recycle experienced in the process of subduction. This concludes that such crusts might be as the same as the age of Earth.
- However, sometimes there is a formation of newer continental crust over oceanic crust due to formation of rock resulted due to passage of time and only these newer crusts are younger to oceanic crusts.
Hence, it can be concluded that the statement above that Continental crust is younger than the oceanic crust is FALSE.
To know more about Continental crusts, refer to the link below.
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