During winter, red foxes hunt snow-covered mice without even seeing their prey—but how?Certainly, hearing plays a crucial role, but researchers from the Czech Republic and Germany found that European foxes pounce on mice much more successfully when facing north, leading them to suggest a more magnetic answer.
It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites.
Because the exact amount of time this accretion process took is not yet known, and the predictions from different accretion models range from a few million up to about 100 million years, the exact age of Earth is difficult to determine.
It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages.
Studies of strata, the layering of rocks and earth, gave naturalists an appreciation that Earth may have been through many changes during its existence.
This led him to estimate that Earth was about 75,000 years old.