Scienc G8 Rev PSHS

Scienc G8 Rev PSHS

8th Grade

122 Qs

quiz-placeholder

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Scienc G8 Rev PSHS

Scienc G8 Rev PSHS

Assessment

Quiz

Science

8th Grade

Easy

Created by

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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