Official Kids Mag www.kidscoop.com © Vicki Whiting June 2022
6
If you sit on the beach and look out
over the ocean, you will see water
that stretches for miles and miles.
However, a person could get
very thirsty sitting all day next
to the ocean.
Human kidneys get rid of excess salt in the body. The kidneys
use water to clear out the excess salt. The problem with drinking
salt water is that the amount of water it would take to get rid of
the salt in a cup of salt water is greater than the amount of water
in that cup of salt water. So, by drinking salt water your body
needs more water to clear out the salt, leaving a person even
more thirsty.
a large bowl
warm water
an egg
salt
spoon
Question: How can you make an egg float in a
bowl of water?
Hypothesis*:
*Note: a hypothesis means a thoughtful guess.
Fill your bowl with warm water.
Gently place the egg in the water. What happens?
Remove the egg and stir at least one cup of salt into the
water. Stir until you can't see any more grains of salt.
The water will look cloudy.
Place the egg in the salty water. What happens?
1.
2.
3.
4.
Did the egg float? Adding salt to water makes it heavier. In
salty water the amount of water the egg displaces weighs
more than the egg and the egg floats.
The Dead Sea in Israel
is the saltiest body of
water in the world. A
person could float on
top of the water and
read Kid Scoop News!
97 percent of the world's water is in the
oceans and the remaining 3 percent is fresh
water. That 3 percent of fresh water divides
into 77 percent contained in icecaps and
glaciers, 22 percent in groundwater aquifers
(the source of our drinking water) and this
leaves only one percent which make up the
waters in rivers, lakes and streams.
Most of the ocean doesn't freeze. Why?
Salt water freezes at a lower temperature than fresh water.
ice cubes
thread
salt
Soak your thread in some water then lay it
on top of an ice cube.
Sprinkle a tiny bit of salt along the thread
and wait about 30 seconds.
Lift the thread. Does the ice cube cling to
the thread and get lifted as well?
1.
2.
3.
Explanation: The salt melts the surface of
the ice. The coldness of the ice then refreezes
this water, trapping the thread and freezing it
to the ice.
Salt is put on icy roads to melt the
ice and make the roads safer.
Arrrrrr!
Water, water
everywhere,
but not a drop
to drink!
