Why are iron oxides in rocks evidence for prehistoric photosynthesis?
A. Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
B. Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
C. Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.
D. Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.
chemical reaction
chemical bonds
chemical bonds
C3H6O3
Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
100%
No one
No one, the third one is actually bond number not chemical bonds but the rest are correct
no one and lily, ur both life savers<3
1. chemical reaction
2. chemical bonds
3. bond number
4. C3H6O3
5. Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
100/100 correct
The correct answer is A. Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
To understand why, we need to delve into the process of photosynthesis and the formation of iron oxides in rocks.
Photosynthesis is a vital process in which plants, algae, and some bacteria convert sunlight, water, and carbon dioxide into glucose (sugar) and release oxygen as a byproduct. This process occurs inside specialized structures called chloroplasts, which contain a pigment called chlorophyll responsible for capturing sunlight.
Over millions of years, photosynthetic organisms, such as cyanobacteria (or blue-green algae), played a crucial role in Earth's history as they rapidly increased the oxygen content in the atmosphere through their photosynthetic activities. This process dramatically changed the composition of the atmosphere, allowing the presence of high levels of oxygen.
Now, let's focus on the formation of iron oxides in rocks. Iron (Fe) is a highly reactive element that readily reacts with oxygen (O2) in the presence of water (H2O) or moisture. This reaction leads to the formation of iron oxide minerals, commonly known as rust.
When photosynthesis occurs and oxygen is produced, it enters the Earth's atmosphere. Over time, this oxygen reacts with iron-rich minerals found in rocks, and iron oxides begin to form. These iron oxides are commonly observed as red, orange, or brown colors in various rock formations.
Therefore, when we encounter iron oxides in rocks, it becomes evidence of prehistoric photosynthesis because it indicates the presence of atmospheric oxygen, which is a byproduct of photosynthesis.
thank u thank u thank u
I plugged the question into Google and came up with this. It answers the question completely. You will need to add the h t t p s:// in front without the spaces.
news.wisc.edu/ancient-rocks-record-first-evidence-for-photosynthesis-that-made-oxygen/