WCAS - Washington Comprehensive Assessment of Science Earth and Human Activity Questions and Answers

Question 1

A coastal community in Washington notices a significant increase in the frequency and size of harmful algal blooms in the nearby estuary, leading to 'dead zones' where fish cannot survive.
Which human activity is the MOST likely cause of this phenomenon, known as eutrophication?

Accepted Answer

Runoff of fertilizers and animal waste from agricultural areas upstream.

Answer

Increased carbon dioxide emissions from local industrial plants.

Answer

The construction of a new dam on a river that feeds into the estuary.

Answer

Overfishing of commercially important fish species within the estuary.

Question 2

Which of the following provides the MOST direct evidence that human activities are the primary driver of recent global warming?

Accepted Answer

The correlation between the sharp rise in global temperatures and the equally sharp rise in atmospheric CO2 concentrations since the Industrial Revolution.

Answer

Records of natural climate cycles, like ice ages, showing that Earth's temperature has always fluctuated.

Answer

An increase in the number of sunspots and solar flare activity over the last 50 years.

Answer

Observations of volcanic eruptions releasing large quantities of greenhouse gases into the atmosphere.

Question 3

A city located in a seismically active region of Washington State is updating its building codes to improve safety during an earthquake. Which engineering strategy would be most effective at mitigating damage to a new skyscraper?

Accepted Answer

Installing a base isolation system with lead-rubber bearings to absorb seismic energy.

Answer

Using rigid, thick concrete walls to prevent any movement of the building.

Answer

Anchoring the building's foundation directly and deeply into the bedrock.

Answer

Making the building as lightweight as possible using only wood and glass.

Question 4

The rise of 'green' technologies like electric vehicles and wind turbines has increased the demand for rare earth minerals. Which of the following is a significant negative environmental consequence associated with the mining of these minerals?

Accepted Answer

Contamination of soil and water with toxic and radioactive materials.

Answer

A large reduction in atmospheric oxygen levels near mining sites.

Answer

The process is energy-neutral, having no impact on greenhouse gas emissions.

Answer

The creation of new, fertile topsoil through the mining process.

Question 5

According to multiple international scientific assessments, which human activity is the single largest driver of biodiversity loss globally?

Accepted Answer

Changes in land use, primarily for agricultural production.

Answer

The introduction of invasive species into new habitats.

Answer

The spread of plastic and chemical pollution in the oceans.

Answer

The construction of large urban centers and associated sprawl.

Question 6

A community is debating a proposal to restore a large wetland area that was previously drained for development. Which of the following is the STRONGEST argument for undertaking the restoration project based on the ecosystem services wetlands provide?

Accepted Answer

Wetlands act as natural water purifiers and provide crucial flood control.

Answer

The restored wetland will provide a scenic location for building new homes.

Answer

The project will increase local property values by creating waterfront views.

Answer

The restoration will immediately eliminate all mosquito populations in the area.