Question

Write a short note on the earth

Answer 1

The large mass of the Sun makes Earth move around it, just as the mass of Earth makes the moon move around it. Earth also turns around in space, so that different parts face the Sun at different times. Earth goes around the Sun once (one year) for every 3651⁄4 times it turns around (one day).Earth is the only planet in our solar system that has a large amount of liquid water.About 74% of the surface of Earth is covered by liquid orBecause of its water, Earth is home to millions of species of plants and animals.The things that live on Earth have changed its surface greatly. For example, early cyanobacteria changed the air and gave it oxygen. The living part of Earth's surface is called the "biosphere"

Answer 2

Answer:

1. The age of earth is estimated at a little over 4.5 billion years .
2. Working this out was a difficult problem to solve.
3. The problem was trackled by earth scientists in the twentieth century .
4. The basic facts about the planet were unknown.
5. Morden estimates are based on radioactive dating methods .
6. This gives an age for the solar system and an upper limit for the age of Earth.