1. Which of the following gases was most likely present in earths atmosphere A. Nitrogen B. hydrogen .C argon D. Oxygen
Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time scale using fossilized remains from Europe and Asia B. Scientists developed the geologic time scale by studying Rock layers and index fossils worldwide. C. The geologic
Hydrogen was one of the gases that was most likely present in the Earth's earliest atmosphere. With the hydrogen, there was also methane, water vapor, and ammonia. Carbon Dioxide was also present and there was hardly any oxygen, if at all, present in the early atmosphere.
So which one was it?
its hydrogen bro read da second responder =-=
the answer is hydrogen
To determine the answer to the first question, we can look at the composition of Earth's atmosphere. The most abundant gas in Earth's atmosphere is nitrogen, which makes up about 78% of the total. Hydrogen and argon are present in much smaller amounts, with hydrogen making up about 0.00005% and argon making up about 0.93%. Oxygen, although important for supporting life, actually makes up only about 21% of Earth's atmosphere.
Therefore, the correct answer is A. Nitrogen.
For the second question, the development of the geologic time scale involved studying rock layers and index fossils worldwide. Scientists analyzed the different layers of rocks and observed the variations in fossil assemblages within these layers. By comparing these observations across different locations, they were able to establish a relative chronological order of the rock layers and the fossils found within them.
Therefore, the correct answer is B. Scientists developed the geologic time scale by studying rock layers and index fossils worldwide.