The correct answer is - cyanobacteria.
The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.
Answer:
C Weathering breaks different rocks down into sediment.
D Erosion carries the sediment dawn hill.
A Sediments are deposited in specific places.
E The sediments impact due to pressures.
B The sediments are cemented together forming a sedimentary rock.
Explanation:
- The rock cycle takes place from the igneous rocks that are primary rocks that are eroded and leading to the formation of sediments and watch later on get deposited downhill.
- Their compaction along with the pressure over the period of time leads to the formation and consolidation of sedimentary rocks. This there a product of weathering, transportation, deposition, and cementation.
