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.
A triangle’s angles are equivalent to 180 degrees so the third angle would have to equal 20 degrees
Why is Quechua still present in modern-day South America?
A) It is a required subject in every school.
B) It was brought by European invaders and perpetuated throughout the continent.
C) It is an indication of wealth and achievement.
D) It was imposed on every tribe conquered by the Incas.
Answer: Option D
<u>Explanation:</u>
Incas was also known as the Inca Empire or the Incan Empire was known as the largest empire in pre-Columbian America. Most of the scholars do consider its political and administrative structure. And these structure are considered as the most developed Empire in the Americans before the arrival of the Columbus happened.
Hello friend,
if i am not wrong crust is believed to generate its magnetic field..
hope that helps u
Native Americans in the Great Lakes–St. Lawrence Lowlands _____ before the arrival of Europeans.
died out from warfare and disease
were hunters and gatherers
lived in seacoast villages
lived in permanent settlements
