Understanding time scales
I can describe key events in the history of Earth and distinguish between billions, millions and thousands of years ago.
Understanding time scales
I can describe key events in the history of Earth and distinguish between billions, millions and thousands of years ago.
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Lesson details
Key learning points
- Evidence suggests Earth was formed 4.5 billion years ago (one billion is one thousand million).
- Evidence suggests the first living organisms (microorganisms) appeared around 3.8 billion years ago.
- The oldest fossils are around 3.5 billion years old, and the newest fossils are around 10 thousand years old.
- Evidence suggests the first land plants appeared 500mya, the first mammals 200mya, and modern humans 350k years ago.
- Scientists divide Earth’s history into eons, periods and epochs to make it easier to understand.
Keywords
Billion - One billion is one thousand million (1 000 000 000).
Thousand - One thousand (1000) is equal to 10 × 10 × 10.
Million - One million is one thousand thousand (1 000 000).
Evolution - The characteristics of species gradually change over time, sometimes forming new species. This process is called evolution.
Extinction - Extinction is the permanent loss of a species.
Common misconception
Students struggle to comprehend absolute ages of key events in the history of Earth and evolutionary history.
This lesson provides many examples and context to give students a sense of the differences in time scales involved in the history of Earth and evolution.
To help you plan your year 9 science lesson on: Understanding time scales, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 9 science lesson on: Understanding time scales, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 science lessons from the Adaptations, competition, natural selection and evolution unit, dive into the full secondary science curriculum, or learn more about lesson planning.
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Adult supervision recommended
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Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
