Scienc G8 Rev PSHS

Quiz
•
Science
•
8th Grade
•
Easy
Amia Audrey
Used 1+ times
FREE Resource
122 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
In the context of scientific inquiry, which of the following best illustrates the principle of falsifiability?
Accepting a theory simply because it aligns with common belief
Relying solely on anecdotal evidence to support a claim
Designing experiments that can potentially disprove a hypothesis
Adopting a hypothesis without further testing
Using historical data to confirm present trends
Answer explanation
Correct Answer: C
Explanation: Falsifiability is a cornerstone of the scientific method. It means that a hypothesis must be structured so that it can be tested and potentially disproven through experiments or observations. This approach ensures that scientific ideas are robust and subject to continual scrutiny.
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Which process best explains the formation of distinct layers in Earth’s lithosphere?
Accretion of cosmic dust over time
Radioactive decay of surface elements
Differentiation during Earth’s early molten state
Weathering and erosion by atmospheric forces
Impact events from meteor showers
Answer explanation
Correct Answer: C
Explanation: During Earth’s early history, the planet was largely molten. In this state, heavier elements sank toward the center while lighter elements rose to the surface, leading to the formation of distinct layers such as the core, mantle, and crust.
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
How do hydrologic processes contribute to the shaping of Earth’s surface features?
By dissolving and transporting minerals across different regions
By directly causing tectonic shifts
By generating the Earth’s magnetic field
By increasing the frequency of volcanic eruptions
By blocking sunlight from reaching the surface
Answer explanation
Correct Answer: A
Explanation: The hydrosphere plays a critical role in landscape evolution. Water dissolves minerals and carries sediments from one location to another, which leads to erosion, sediment deposition, and the creation of various landforms.
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Which of the following best explains the concept of feedback loops in Earth’s biosphere?
A process where a change in a system leads to further changes that amplify or reduce the original effect
A random occurrence without any measurable impact
A one-time event that permanently alters an ecosystem
A process that only affects isolated populations
A series of events that are completely unrelated to previous conditions
Answer explanation
Correct Answer: A
Explanation: A feedback loop occurs when a change in a system produces effects that either reinforce (positive feedback) or diminish (negative feedback) the initial change. This concept is fundamental in understanding climate dynamics and ecosystem interactions.
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Why is understanding atmospheric circulation important for predicting weather phenomena like typhoons?
Because it solely determines tectonic activity
Because it explains the movement and formation of storm systems
Because it directly influences Earth’s orbit
Because it solely drives volcanic eruptions
Because it is unrelated to weather patterns
Answer explanation
Correct Answer: B
Explanation: Atmospheric circulation redistributes heat and moisture around the globe. This movement is crucial for the development and trajectory of storm systems, including typhoons, making it a key element in weather prediction.
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Which aspect of volcanoes best demonstrates the interconnectedness of Earth’s internal processes?
The color of the volcanic ash
The seemingly random frequency of eruptions
The role of tectonic plate movement in magma formation
The occurrence of eruptions exclusively during daylight hours
The existence of volcanoes only in isolated regions
Answer explanation
Correct Answer: C
Explanation: Volcanoes are closely linked to tectonic activity. The movement of tectonic plates causes stress and melting in the mantle, leading to magma formation and eventual volcanic eruptions. This process shows how internal geodynamic forces shape Earth’s surface.
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What is the most significant factor influencing the propagation of seismic waves during an earthquake?
The time of day when the earthquake occurs
The type of rock and geological structures in the lithosphere
The color and composition of surface minerals
The presence of vegetation in the affected area
The weather conditions at the time of the event
Answer explanation
Correct Answer: B
Explanation: Seismic waves travel at different speeds and directions depending on the physical properties of the materials they encounter. Variations in rock type, density, and the structure of geological layers greatly influence the behavior of these waves during an earthquake.
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