WCAS - Washington Comprehensive Assessment of Science Earth's Systems and Processes Questions and Answers

Question 1

A geologist studying the rock cycle finds a sample of shale, a sedimentary rock, that has been subjected to intense heat and pressure deep within the Earth's crust, transforming it into slate. Which of the following geological processes is responsible for this change?

Accepted Answer

Metamorphism

Answer

Metamorphism is the process where existing rocks are altered by heat, pressure, or reactive fluids. The transformation of shale into slate is a classic example of metamorphism, where the original rock changes form without melting. [1, 3, 22, 24]

Question 2

At a convergent boundary where a dense oceanic plate collides with a less dense continental plate, which of the following landforms are most likely to be created?

Accepted Answer

A deep ocean trench and a volcanic mountain range

Answer

When an oceanic plate subducts under a continental plate, the plunging plate creates a deep depression in the seafloor called a trench. The subducting plate melts as it descends into the mantle, and the resulting magma rises to the surface of the continental plate, forming a chain of volcanoes, or a volcanic mountain range. [27, 28]

Question 3

Which of the following is the primary source of energy that drives the Earth's water cycle, causing evaporation and transpiration?

Accepted Answer

Solar radiation from the Sun

Answer

The Sun's energy is the fundamental driver of the water cycle. It provides the heat necessary for water to evaporate from oceans, lakes, and rivers, and for plants to release water vapor through transpiration. [4, 5, 9, 12, 19]

Question 4

A news report states, 'The average annual precipitation in the Amazon rainforest has been consistently decreasing over the past 30 years.' This statement is a description of the region's:

Accepted Answer

Climate

Answer

Climate refers to the long-term average of weather patterns in a specific area, typically over 30 years or more. A statement about a consistent trend over three decades describes climate, not short-term weather conditions. [11, 13, 16, 17]

Question 5

The ozone layer is a critical component of Earth's atmosphere that absorbs the majority of the Sun's harmful ultraviolet (UV) radiation. In which atmospheric layer is the ozone layer primarily located?

Accepted Answer

Stratosphere

Answer

About 90% of the Earth's ozone is found in the stratosphere, which is the layer of the atmosphere located from approximately 10 to 50 kilometers above the surface. This concentration of ozone forms the protective ozone layer. [14, 18, 20, 21, 25]

WCAS - Washington Comprehensive Assessment of Science Practice Test

WCAS - Washington Comprehensive Assessment of Science Practice Test

WCAS - Washington Comprehensive Assessment of Science Earth's Systems and Processes Questions and Answers