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Unit 6: Sound, the Earth and eclipses

GRADE 6 – Unit 6: Sound, the Earth and eclipses — HIA International - Grade 6 Revision Notes & Topical Questions

5 min read 7 parts Lesson 1 of 7 1 quiz

📚 HIA International - Grade 6 Hub / Topical Revision
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Lesson summary

Unit 6: Earth physics — HIA INTERNATIONAL notes: Explain sound as vibrations, its reflection, the structure of the Earth, geological change and eclipses.Vibration — things that vibrate make soundsSound travels as a wave through particles in a medium.Vacuum — sound cannot travel b…

  • Tectonic plates
  • Plate boundaries
  • Solar eclipse
  • Lunar eclipse
  • Sound wave
  • Vacuum — sound cannot travel because there are no particles to vibrate

Part 1 of 5Sound

Vibration
  • Vibration things that vibrate make sounds
  • Sound travels as a wave through particles in a medium.
Vacuum
  • Vacuum sound cannot travel because there are no particles to vibrate

Part 2 of 5Reflection of sound

Echo
  • Echo the reflection of a sound wave
  • Large, smooth, flat surfaces reflect sound best.
Uses
  • Uses bats find insects, boats find water depth, and scans make images of an unborn baby

Part 3 of 5Structure of the Earth

Layers
  • Layers crust of solid rock, mantle of molten rock, outer core of molten nickel and iron, inner core of solid nickel and iron
Tectonic plates
  • Tectonic plates the crust is made of plates that move about 4 cm each year on magma

Part 4 of 5Changes in the Earth

Changes in the Earth
Plate boundaries
  • Plate boundaries geological change happens where plates move together, apart or slide past each other
Features
  • Features fold mountains, volcanoes and earthquakes

Part 5 of 5Eclipses

Solar eclipse
  • Solar eclipse the Moon comes between the Sun and the Earth
Lunar eclipse
  • Lunar eclipse the Earth comes between the Sun and the Moon

Key terms

TermMeaning
Sound waveVibrations of particles that carry sound energy.
EchoThe reflection of a sound wave.
Tectonic platesLarge pieces of the Earth's crust that move slowly.
MagmaLiquid rock underground.
Solar eclipseThe Moon passing between the Sun and the Earth.
Lunar eclipseThe Earth passing between the Sun and the Moon.

Avoid these mistakes

1
Saying sound travels in a vacuum — it needs particles
2
Saying the mantle is solid — it is molten rock that can flow
3
Saying a solar eclipse is when the Earth blocks the Sun's light — the Moon does
4
Saying eclipses happen every month — the Moon's orbit is tilted

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