The diagram below shows the formation of a volcanic arc. This arc was formed as a result of an oceanic plate moving underneath a continental plate in a subduction zone.
Image courtesy of USGS
Volcanic eruptions result in magma rising from the interior of Earth toward the surface. Lava is magma that reaches the surface of Earth. Magma and lava cool to form solid rocks that contain minerals from deep inside Earth. These rocks include metal ores, which are rocks that contain metallic minerals (such as copper, gold, silver, lead, and zinc).
Based on this information, which of the following is most likely to be true?
A.
The distribution of metallic minerals on Earth is uneven and depends on the geologic processes that occurred in the past.
B.
The distribution of metallic minerals on Earth is evenly spread across all continents because geologic processes occur uniformly.
C.
The distribution of metallic minerals on Earth cannot be predicted due to the inconsistent formation of these minerals.
D.
The distribution of metallic minerals on Earth cannot change over time because volcanic activity does not occur any more.
A. The distribution of metallic minerals on Earth is uneven and depends on the geologic processes that occurred in the past.
Yes, I am sure. The distribution of metallic minerals on Earth is uneven and depends on the geologic processes that occurred in the past. These processes, such as volcanic activity in subduction zones, are responsible for the formation and distribution of metallic minerals in specific areas. This results in an uneven distribution of metallic minerals on Earth.
B. Plan B will limit habitat disruption better than plan A.
I apologize for the confusion in my previous response. Let me correct that.
The state officials probably chose Plan B because it will limit habitat disruption better than Plan A. Underground tunnels in Plan B will minimize the impact on the habitats of various plant and animal populations compared to aboveground track construction in Plan A. By choosing Plan B, the state officials are prioritizing the preservation of biodiversity in the area.
C. 1 and 3 only
Observation 1 indicates a color change upon mixing, which is often an indication of a chemical reaction. Observation 3 suggests an increase in temperature, which can also be a characteristic of a chemical reaction. The increase in temperature is a result of the release of energy in an exothermic reaction.
you sure
A state was planning to construct several hundred miles of a new railway in an area that was currently the habitat of various plant and animal populations. During the planning stage, the state officials asked two scientists to create plans to reduce the impact of the railway construction on the biodiversity of the area. The two plans are described below.
Plans for Maintaining Biodiversity in an Area Proposed for Railway Construction
Plan Plan Highlights
Plan A
Perform a wildlife survey to determine the best locations for construction based on the presence of endangered or threatened species.
Start construction of aboveground rail tracks in selected locations; as the construction proceeds, create wildlife corridors that help connect divided animal populations to maintain genetic diversity in the region.
After the construction is complete, replant with native plants along cleared construction areas where possible.
Continue to monitor the area for changes in populations and form new action plans as needed.
Approximate cost of plan: $5 billion.
Plan B
Perform a wildlife survey to determine the best locations for construction based on the presence of endangered or threatened species.
Dig large underground tunnels in selected areas where all of the rail tracks will be constructed.
Line tunnels with concrete to provide stability, construct rail tracks, and then cover the disrupted areas with soil and native plants so that the habitat is only minimally impacted by the presence of underground railways.
Continue to monitor the area for changes in populations and form new action plans as needed.
Approximate cost of plan: $30 billion.
State officials decided to go with plan B. Why did the state officials probably choose plan B?
A.
The economic demands of plan B will be lower than those of plan A.
B.
Plan B will limit habitat disruption better than plan A.
C.
Plan B will require fewer materials for construction than plan A.
D.
The construction time will be less for plan B than for plan A.
are you sure
Paige received two 10 mL samples of unknown liquids from her teacher. She combined the substances according to her instructions and recorded the following observations:
1. When the two colorless liquids combined, the color changed to purple.
2. The volume of the combined liquids was 20 mL.
3. The temperature of the liquids rose 10°C after they were combined.
4. The density of the combined liquids was 1.7 g/mL.
Based on her observations, Paige concluded that a chemical reaction took place. Which of her observations support her conclusion?
A.
3 and 4 only
B.
1, 2, and 3 only
C.
1 and 3 only
D.
1 only