Examlex
If you obtained a sample of Martian rock, determined the abundances of 230U and 207Pb in it, and found that for every one uranium atom there were seven lead atoms, then what would the age of this rock be? Note that 230U decays to 207Pb with a half-life of 700 million years. Assume that there was no 207Pb in the rock when it originally formed.
Penguin
A flightless seabird native to the Southern Hemisphere, particularly known for its distinctive black and white plumage.
Goose
A waterfowl of the family Anatidae, known for its long neck, webbed feet, and often migratory behavior.
Ostrich
The largest living bird species, native to certain large areas of Africa, known for its speed and ability to lay large eggs.
Prototype
An initial model or version of a product that is used to test and refine its features.
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