The ocean crust is known to show a sequence of magnetic polarity given that it shows us that there is the formation of a new sea floor at the mid ranges of the ocean. This is where they are seen to separate from themselves on the sides of the ridge.
<h3>What is seafloor spreading?</h3>
This is the term that is used to refer to the spreading that occurs at the mid ocean ridges. These are the areas where the new oceanic crusts get to be formed.
Hence we can say that The ocean crust is known to show a sequence of magnetic polarity given that it shows us that there is the formation of a new sea floor at the mid ranges of the ocean. This is where they are seen to separate from themselves on the sides of the ridge.
Read more on seafloors here: brainly.com/question/23287809
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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.
Simplifying 4m + 9 + 5m + -12 = 42 Reorder the terms: 9 + -12 + 4m + 5m = 42 Combine like terms: 9 + -12 = -3 -3 + 4m + 5m = 42 Combine like terms: 4m + 5m = 9m -3 + 9m = 42 Solving -3 + 9m = 42 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 9m = 42 + 3 Combine like terms: -3 + 3 = 0 0 + 9m = 42 + 3 9m = 42 + 3 Combine like terms: 42 + 3 = 45 9m = 45 Divide each side by '9'. m = 5
