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RUDIKE [14]
3 years ago
11

What extrusive igneous rock type cooled so quickly that visible crystal grains never grew, and the rock is composed entirely of

black silicate glass that easily shatters into sharp, knife-like shards?
(A) Obsidian
(B) Pumice
(C) Scoria
(D) Tuff
Geography
2 answers:
Len [333]3 years ago
8 0
I think the answer is A
Kipish [7]3 years ago
4 0

Answer:

A. Obsidian

Explanation:

It fits the property described in the question.

It cools so fast that no visible crystal or grain could form. It has high silica Composition, black and glassy. It is also used to make tools with sharp edges

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Which of the following is not essential in the formation of black shale units?
melamori03 [73]

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.

6 0
3 years ago
The exclusion of Lucretia Mott and Elizabeth Cady Stanton from participating in the World's Anti-Slavery Convention in London in
dsp73

Answer:

It encouraged them to organize the first Women's Rights convention in Seneca Falls New York.

Explanation:

The World's Anti-Slavery Convention was held in London in 1840 and at this convention, women were denied participation at the convention. They were only allowed to view the proceedings from a gallery at one side of the hall. It was there that Lucretia Mott and Elizabeth Cady Stanton met each other.

As they went home together, they discussed the obvious exclusion of women from the convention. There and then, they resolved to organize the Women's Rights convention that held in 1848. These two women actively campaigned for women's rights.

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If HJ=32 and LK=60 , find MN
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