Biology, 30.01.2020 17:57 sofialarrea13

1. what caused dissolved iron to rust and deposit in banded iron formations?

a. outgassing

b. oxygen released by living cyanobacteria

c. huge amounts of rain

d. an asteroid impact

2. which of these was the first source of oxygen in our atmosphere

a. oxygen produced by living things on land

b. oxygen released by volcanoes

c. oxygen released by living cyanobacteria in the ocean which then was released into the atmosphere

d. the original accretion of the earth

Answers: 3

Show answers

Answers

Oxygen released by living cyanobacteria caused dissolved iron to rust and deposit in banded iron formations. This implies the correct answer is B.

The first source of oxygen was the oxygen released by living cyanides in the ocean which then was released into the atmosphere. This implies the correct answer is C.

Further Explanation

Question 1:

Banded iron formations are the major part of sedimentary rock. These formations are of always of the earliest part of the earth’s history also known as Precambrian age.

The general theory is that banded irons layers were developed in seawater due to the oxygen that was released by cyanobacteria. The oxygen that was released then joins with dissolve irons to form insoluble iron oxide and a thin layer on the floor of the ocean.

Most of the oldest rock formations and linked with banded iron formations and they are made up of approximately 60% of global iron reserves. Banded iron formations can be found in the following places: United States, Ukraine, South Africa and many more.

Question 2:

The first source of oxygen is oxygen released by living cyanides in the ocean which then was released into the atmosphere.

The first microbe to produce oxygen in our atmosphere is known as Cyanobacteria. Cyanobacteria or blue-green algae produce the first oxygen about 3.5 billion years ago by photosynthesis.

LEARN MORE

What caused dissolved iron to rust and deposit in banded iron formations? One of the most recognizable corrosion reactions is the rusting of iron

KEYWORDS:

banded iron

Answer from: Quest

the eggs of the insects should be the first thing collected at the scene.

false

Answer from: Quest

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

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1. what caused dissolved iron to rust and deposit in banded iron formations?

a. outgass...

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