Earth's Changing SurfaceGrade 4 Science for Kids

Weathering, erosion and deposition shape mountains, valleys and deltas.

Earth's Changing Surface helps fourth graders sort weathering, erosion and deposition, see ice crack a rock over and over, and follow a river as it builds a delta. Earth science about the forces that shape land.

  • Grade 4 · Ages 9–10
  • 3 lessons
  • 3 experiments
  • 12 practice questions
  • About 25 min
Start Learning Free Open the Course
  • Break, Move, Drop
  • Process Sort
  • Ice Cracks Rock
  • Freeze-Thaw Test
  • A River Builds a Delta
  • Mountain to Delta

Science lab course · Grade 4

Earth's Changing Surface · Learning goals

What Your Child Will Learn

Sort weathering, erosion and deposition, crack a rock with ice over and over, and follow a river as it builds a delta.

  • Weathering breaks rock, erosion moves it, and deposition drops it in a new place.
  • Water expands when it freezes. Repeated freezing and thawing cracks rocks apart.
  • Rivers carry sediment from mountains and drop it where they slow down, building deltas.

Why it matters

Why This Matters for Kids

  • Slow but powerful

    Kids learn how water, ice and wind slowly shape mountains, canyons and coastlines.

  • Key vocabulary

    Weathering, erosion and deposition are core grade 4 earth science terms.

  • Real places

    Understanding deltas and canyons makes maps and travel more meaningful.

Inside Earth's Changing Surface

How the Course Works

Each level has a short read-aloud lesson, an interactive experiment and a mini quiz.

  1. Step 1 · Lesson

    Break, Move, Drop

    Weathering breaks rock into smaller pieces.

  2. Step 2 · Experiment

    Process Sort

    Earth's surface is always changing. Is each example weathering, erosion or deposition?

  3. Step 3 · Lesson

    Ice Cracks Rock

    Water seeps into tiny cracks in rocks.

  4. Step 4 · Experiment

    Freeze-Thaw Test

    Let's freeze and melt water in a rock's crack many times and measure how long the crack grows.

  5. Step 5 · Lesson

    A River Builds a Delta

    Fast rivers in mountains carry lots of sediment: sand, mud and pebbles.

  6. Step 6 · Experiment

    Mountain to Delta

    Let's follow sediment from a mountain to the sea. Put the steps in order.

Lesson preview

A Peek Inside the Lesson

This is the real lesson text your child hears, read aloud by a friendly voice.

Break, Move, Drop

Weathering breaks rock into smaller pieces.

Erosion moves the pieces away, using water, wind or ice.

Deposition drops the pieces in a new place, building new land.

Ice Cracks Rock

Water seeps into tiny cracks in rocks.

When water freezes, it expands and pushes the crack wider.

Freezing and melting again and again breaks rocks apart. This makes potholes too!

A River Builds a Delta

Fast rivers in mountains carry lots of sediment: sand, mud and pebbles.

Near the sea, the river slows down.

Slow water can't carry sediment, so it drops it. Over time this builds a delta.

For parents

Try It at Home

Learning sticks best when kids use it in real life. Here are simple ideas from this course.

Parent Tip

Fill a small plastic bottle with water, cap it and freeze it. Look at how it bulges, and talk about how ice can crack rocks.

Process Sort

  1. Shake sugar cubes in a jar for 2 minutes (weathering).
  2. Pour water to wash the crumbs to one end (erosion).
  3. See where the crumbs settle (deposition).

Weathering breaks rock, erosion moves it, and deposition drops it in a new place.

Freeze-Thaw Test

  1. Fill a small plastic bottle to the top with water and cap it.
  2. Freeze it overnight.
  3. Look: the ice pushed the bottle out of shape!

Water expands when it freezes. Repeated freezing and thawing cracks rocks apart.

Mountain to Delta

  1. Pile sand at one end of a tilted tray.
  2. Pour water slowly at the top.
  3. Watch where the sand settles at the bottom: a mini delta!

Rivers carry sediment from mountains and drop it where they slow down, building deltas.

Practice

Grade 4 Science Practice Questions

Real questions from Earth's Changing Surface. Try them with your child, then tap to see the answer.

  1. Question 1

    What does weathering do?

    • A.Moves rock
    • B.Breaks rock into pieces
    • C.Builds volcanoes
    Show answer

    Breaks rock into pieces

  2. Question 2

    What happens to water when it freezes?

    • A.It shrinks
    • B.It disappears
    • C.It expands
    Show answer

    It expands

  3. Question 3

    What is sediment?

    • A.Sand, mud and pebbles carried by water
    • B.A kind of fish
    • C.Clean water
    Show answer

    Sand, mud and pebbles carried by water

The full course has 12 questions with instant feedback, stars and rewards. Create a free account to play them all.

Earth's Changing Surface · Questions from parents

Frequently Asked Questions

What age is this course for?

Earth's Changing Surface is a grade 4 science course for kids ages 9–10. That is Year 5 science in the UK and Year 4 in Australia. It also works well for review in the next grade, or as a challenge for a confident younger learner.

What will my child learn?

Sort weathering, erosion and deposition, crack a rock with ice over and over, and follow a river as it builds a delta. Along the way they practice: Weathering breaks rock, erosion moves it, and deposition drops it in a new place; Water expands when it freezes. Repeated freezing and thawing cracks rocks apart; Rivers carry sediment from mountains and drop it where they slow down, building deltas.

How long does the course take?

About 25 minutes in total, split into 3 short levels. Most kids finish it over two or three sessions. Progress is saved, so they can stop any time and pick up where they left off.

Is this course free?

Earth's Changing Surface is part of SkillBloom Premium, which unlocks every course in every subject. Each subject also has free courses, so your child can try SkillBloom before you decide.

Does my child need to read well to use it?

No. Every lesson has a friendly read-aloud voice, questions are read aloud too, and the pictures help kids follow along. Confident readers can turn the voice off.

Can we use it for homeschool?

Yes. SkillBloom is built for homeschooling families. Kids work through lessons, games and quizzes on their own, and the parent dashboard shows what they finished and which skills need more practice. It works on phones, tablets and laptops.

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