---
title: "Fast and slow Earth changes"
description: "Use information from several sources to provide evidence that Earth events can occur quickly (earthquakes, volcanic eruptions) or slowly (erosion, mountain building)"
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: 2026-09-12
---

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# Fast and slow Earth changes

Use information from several sources to provide evidence that Earth events can occur quickly (earthquakes, volcanic eruptions) or slowly (erosion, mountain building)

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 rapid Earth events (earthquake, volcanic eruption, landslide, flood)
- Give at least two examples of slow Earth processes (erosion, mountain formation, canyon carving)
- Use evidence from text, images, or video to support the distinction between fast and slow changes

## Lesson: Rapid earth changes

Earth is always changing. Some changes happen in just a few seconds, like an earthquake shaking the ground. Other changes take a very, very long time, like a river slowly cutting through rock. Both kinds of change are real, they just happen at different speeds.

*(drawing: The short bars are changes that happen fast. The tall bars are changes that take a very long time.)*

**Example.** Mia watches a video of a volcano erupting. Hot lava pours out in just a few minutes. Later, she looks at old photos of a canyon taken 50 years apart. The canyon looks only a little bit deeper. The river carved that canyon slowly, over thousands of years.

**Tip.** To tell if a change is fast or slow, think about your evidence. A video that shows the whole change happening is a clue it was fast. Old photos that barely look different are a clue the change was slow.

**Recap.** Some Earth changes happen in seconds, like an earthquake or a volcano. Others take thousands of years, like a river carving a canyon.

## Practice

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

## Needs first

- [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)