1. Which gas is a source of natural groundwater pollution?
A. Carbon
B. Oxygen
C. Hydrogen
D. Radon
D?
4. 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?
5. 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?
how fast are a hurricanes winds?
1. To determine which gas is a source of natural groundwater pollution, we need to understand the properties of each gas listed.
Carbon (A) is not typically a source of natural groundwater pollution. It is a non-reactive gas that is a major component of organic matter and carbon dioxide.
Oxygen (B) is a highly reactive gas that is essential for sustaining life, but it is not a source of natural groundwater pollution.
Hydrogen (C) is a highly flammable and reactive gas, but it is not commonly associated with natural groundwater pollution.
Radon (D) is the correct answer. Radon is a colorless and odorless gas that is a natural byproduct of the decay of uranium in soil, rocks, and water. It can seep into groundwater sources and become a source of contamination.
4. A stream channel is formed when water (either surface water or groundwater) erodes and transports sediment or rock particles. The correct answer is D. It carves a narrow path into rock.
When water continuously flows over a specific path, it can erode the underlying rock, creating a channel. Over time, this erosion may deepen and widen the channel, but initially, it starts as a narrow path.
Options A and C are incorrect because they describe features formed by different geological processes, such as the carving of a deep and wide channel (commonly associated with rivers) or the creation of a depression that forms a lake (typically formed by glaciation or tectonic activity).
Option B is incorrect because carrying minerals into the ocean is primarily associated with rivers and streams, rather than the formation of a stream channel itself.
5. To determine the number of chemical reactions that are possible regarding the formation of carbonic acid and the dissolving of calcite, we need to consider the reactants and possible reactions involved.
Carbonic acid is formed when carbon dioxide (CO2) dissolves in water, typically through the reaction: CO2 + H2O -> H2CO3.
Calcite (CaCO3) is a mineral that can dissolve in the presence of carbonic acid, often represented by the reaction: CaCO3 + H2CO3 -> Ca2+ + 2HCO3-.
Therefore, the correct answer is D. 2. Two chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite.