8th Grade LEAP 2025 Science Review

What is the importance of studying geologic time?

• It helps scientists understand Earth's history, including the evolution of life and major geological events.

• It allows for the prediction of future geological events with high accuracy.

• It provides a method for dating archaeological artifacts.

• It is primarily used to study climate change over the last century.

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What processes can lead to the formation of high mountains with rounded peaks?

• The movement of tectonic plates and erosion

• Volcanic activity and sedimentation

• Weathering and glacial activity

• Chemical weathering and soil formation

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How do scientists use fossils to understand geologic time?

• To identify the age of rock layers and understand the history of life on Earth.

• To determine the temperature of ancient environments.

• To predict future geological events based on current data.

• To classify rocks based on their mineral composition.

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What role do tectonic plates play in Earth's geology?

• They are responsible for the movement of the Earth's crust, leading to earthquakes, mountain formation, and volcanic activity.

• They create a stable environment for life by preventing geological changes.

• They are responsible for the uniform distribution of minerals across the Earth.

• They help in the formation of ocean currents and weather patterns.

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What is an example of radiation in everyday life?

• Feeling the warmth of the sun on your skin.

• The sound of a ringing phone.

• The taste of salt in food.

• The sight of a rainbow in the sky.

What is the significance of chemical reactions in science?

• They are only important in industrial processes.

• They involve the transformation of substances, leading to new materials and energy changes.

• They are solely responsible for the creation of new elements.

• They have no real impact on scientific research.

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What is erosion and how does it affect landscapes?

• Erosion is the process of wearing away rocks and soil, shaping landscapes and forming valleys and mountains.

• Erosion is the process of planting trees to prevent soil loss.

• Erosion is the process of building up land through sediment deposition.

• Erosion is the process of creating artificial landscapes using concrete.

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What is the difference between a physical change and a chemical change?

• A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

• A physical change involves the creation of new substances, while a chemical change does not alter the substance's form.

• A physical change is reversible, while a chemical change is always irreversible.

• A physical change occurs at the molecular level, while a chemical change occurs only at the atomic level.

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What is the definition of a chemical change?

• A process where substances combine or break apart to form new substances.

• A physical change that alters the appearance of a substance without changing its composition.

• A reaction that occurs only at high temperatures and pressures.

• A method of separating mixtures into their individual components.

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What is a key indicator that a chemical reaction has occurred?

• A change in color is a strong clue that a chemical reaction has taken place.

• The temperature remains constant throughout the reaction.

• The mass of the reactants is equal to the mass of the products.

• The reaction occurs in a closed container.

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