1. Which gas is a source of natural groundwater pollution?

A. Carbon
B. Oxygen
C. Hydrogen
D. Radon
D?

2. A stream channel is formed when water
A. carves a very deep and wide channel into rock.
B. carries minerals into the ocean.
C. creates a depression, which forms a lake.
D. carves a narrow path into rock.
D?

3. How many chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite?
A. 3
B. 10
C. 23
D. 2
A?

#1 is A

#3 is D
idk about #2

I tried with the Answers you gave me the first time I submitted the test but it told me it is incorrect. I thought those were correct as well..

Well, that's ridiculous... I'm sorry! But those answers would make sense..

Is this 8th grade connexus?

hey I'm from there

1. To determine which gas is a source of natural groundwater pollution, we can analyze the options one by one. The gases listed are carbon, oxygen, hydrogen, and radon.

Carbon, oxygen, and hydrogen are unlikely to be the correct answers as they are not typically associated with groundwater pollution. Radon, on the other hand, is a radioactive gas that can be found in underground sources such as rocks and soil. It can seep into wells or other water sources and can pose a health risk if it accumulates to high levels. Therefore, the correct answer is D. Radon.

2. To determine how a stream channel is formed, we can analyze the options given. The options are:
A. a very deep and wide channel carved into rock.
B. minerals carried into the ocean.
C. the creation of a depression, forming a lake.
D. a narrow path carved into rock.

Out of these options, only option D - a narrow path carved into rock - accurately describes the formation of a stream channel. Over time, flowing water can erode and carve through rock or sediment, creating a channel. Therefore, the correct answer is D.

3. For this question, we need to consider the chemical reactions involved in the formation of carbonic acid and the dissolving of calcite. The question asks for the number of possible chemical reactions in this context.

To determine the answer, we can analyze the options provided: A. 3, B. 10, C. 23, and D. 2.

In this case, we can eliminate options A, C, and D as they do not align with the typical number of chemical reactions involved in the given process. The correct answer, therefore, is B. 10.