Use these NCERT dates: Homo erectus lived about 1500000 years ago…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Use these NCERT dates: Homo erectus lived about 1500000 years ago. The Neanderthals appeared about 100000 years ago. Cave art developed about 18000 years ago, and agriculture began about 10000 years ago. The Earth is 4.5 billion years old, shown as one day of 24 hours.
- How many years lie between Homo erectus and the first Neanderthals?
- How many years lie between the cave art and the beginning of agriculture?
- On the clock of the Earth, how many seconds before midnight did agriculture begin?
Need a reminder? The key ideaShow
NCERT brain capacities: Homo habilis to cc, Homo erectus about cc, Neanderthal man about cc. A percentage increase is .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. The dates in years ago, and hours of seconds make seconds.
Plan. Subtract for the gaps. For the clock, scale years of billion to seconds.
Step 1. (a) years.
Step 2. (b) years.
Step 3. (c) seconds.
Answer: years; years; seconds.
Check. The whole of agriculture, the cities and the written word fit into less than a fifth of a second of the Earth's day.
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