Homework Help.?

Question

1 have 2 questions on my homework i need help on please help me =)

If every living thing needs water, how come water isn't used up?

Why don't oceans and lakes dry up like puddles do?

Answer 1

The hydrologic cycle explains the answer to both questions.

I found you a link to a good web site for kids. Read this and you will understand...

http://ga.water.usgs.gov/edu/watercycle.html

Earth's water is always in movement, and the water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth. Since the water cycle is truly a "cycle," there is no beginning or end. Water can change states among liquid, vapor, and ice at various places in the water cycle, with these processes happening in the blink of an eye and over millions of years.

Although the balance of water on Earth remains fairly constant over time, individual water molecules can come and go in a hurry. The water in the apple you ate yesterday may have fallen as rain half-way around the world last year or could have been used 100 million years ago by Mama Dinosaur to give her baby a bath.

To explore the water cycle, choose a topic from the diagram or text links below.

Answer 2

Oceans and lakes dont dry up like puddles do because they are a larger body of water

Answer 3

Every living thing also dies. Eventually the water in the cells will be released. Respiration also releases water into the air. When you breathe onto a mirror you can see the water that has been exhaled.
Animals urinate which returns liquid to the earth. After it evaporates, it is water without the impurities of the urine.
Oceans and lakes are constantly being replenished by streams and rivers running into them. They are so large that evaporation doesn't empty them.
I hope this has helped you some.

Answer 4

because it rains duh, oceans are bigger and puddles are small, so puddles evaporate faster.