---
title: "Fast and slow Earth changes"
description: "Use information from several sources to distinguish rapid Earth events, such as earthquake shaking, from gradual changes, such as mountain-range growth and long-term canyon carving"
canonical: https://lightmysky.com/learn/science/fast-and-slow-earth-changes-mt_ZJu8s-Q1xa
source: https://lightmysky.com/learn/science/fast-and-slow-earth-changes-mt_ZJu8s-Q1xa.md
retrieved: 2026-11-12
---

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# Fast and slow Earth changes

Use information from several sources to distinguish rapid Earth events, such as earthquake shaking, from gradual changes, such as mountain-range growth and long-term canyon carving

Subject: Science · Area: Space Systems & Earth's History · Ages 7 to 8
Page: https://lightmysky.com/learn/science/fast-and-slow-earth-changes-mt_ZJu8s-Q1xa

## Ready when they can

- Give at least two examples of Earth changes that can happen rapidly, such as earthquake shaking, landslides, floods or the start of an eruption
- Give at least two examples of gradual Earth changes, such as mountain-range growth and a river carving a deep canyon over many years
- Use evidence from text, images, or video to support the distinction between fast and slow changes

## Lesson: Fast and slow Earth changes

Earth changes at different speeds. Erosion moves soil or rock pieces and can happen quickly during a storm. Earthquake shaking can happen in seconds or minutes. A landslide can move rock quickly. Lava can start flowing within minutes, but an eruption may continue much longer.

*(drawing: A timed recording can show ground changing during a few seconds of shaking.)*

Some large changes build up over a long time. A river can carve a deep canyon by removing rock over thousands or millions of years. Many mountain ranges grow over millions of years as parts of Earth's outer layer push together. These are examples of gradual change.

*(drawing: This shows a gradual process, not a measured timeline or a drawing of canyon depth.)*

Check the real time covered by evidence. A normal-speed video with time marks can show a rapid change. Time-lapse video speeds up events, so a short film may show a slow change. Dated height measurements showing small rises over many years can support gradual mountain-range growth.

**Example.** Photos are taken at the start, 4 years later, and 4 more years later. Add the gaps: 4 + 4 = 8 years from first to last. Dates give the time span. The photos must also show what changed; dates alone do not prove slow change. A quick event could happen between two photo dates.

**Recap.** Some Earth changes happen quickly; others build up over many years. Check both the change and the real time covered by your evidence.

*The lesson, questions and flashcards were written for this dataset.*

## Practice

8 questions on this page, each with its working shown.

## Optional connections

- [Preventing erosion](https://lightmysky.com/learn/science/preventing-erosion-mt_m6UaSmrQVG)
- [Properties of rocks](https://lightmysky.com/learn/science/properties-of-rocks-mt_R6YoRXkRxS)

## Opens up

- [Natural disaster solutions](https://lightmysky.com/learn/science/natural-disaster-solutions-mt_cpDpjJaE5u)
- [Rock layers as evidence of change](https://lightmysky.com/learn/science/rock-layers-as-evidence-of-change-mt_GheLsWvrJ4)