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6th grade Science Unit 3 Pretest — 20 Questions
Armstrong, Kennedee

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Large and Small Geoscience Processes
Read the passage and answer the following question(s).

Large and Small Geoscience Processes
Earth's surface is constantly changing due to the interactions between its systems. Some changes are microscopic (small spatial scale), while others are very large (large spatial scale). In addition, some changes happen very quickly (small time scale), while others happen very slowly (large time scale).

Earth's tectonic plates are made of oceanic and continental crusts. The plates are constantly moving due to convection in Earth's hot interior, where hot mantle rises and cooler mantle sinks down. Many changes occur at boundaries where the plates meet. There are three main types of plate boundaries: transform, divergent, and convergent. At transform boundaries, plates slide past each other, at divergent boundaries, plates move apart. At convergent boundaries, plates move toward each other, resulting in both plates being pushed up or one plate subducting under the other. Earth's plate boundaries are shown.



Some of Earth's tallest mountains are forming from two continental plates converging. As mountains grow taller each year, they are being acted on by geoscience processes. Wind and water can change the mountain through weathering and erosion. The eroded mountain material can then be transformed in the rock cycle. A mountain and rock cycle is shown.



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Question 9.



What are the two energy sources that power the rock cycle?


wind


the Sun


plate motions


Earth's hot interior


Earth's liquid water

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GPT-5 mini
The Sun and Earth's hot interior.

Explanation: The Sun powers surface processes like weathering, erosion, and the water cycle, while Earth's hot interior drives internal processes like plate motions, melting, and metamorphism.

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