Seawater

Imagine a giant bathtub that covers almost all of Earth! That's kind of like our oceans. Seawater is the water found in these huge oceans and seas.

It's not like the water you drink from your tap, which is called fresh water. Seawater is special because it's full of tiny, tiny bits of salt that make it taste super salty! This salty water is everywhere, making up most of the water on our planet.

It's a big, blue, watery world out there!

Did you know seawater is heavier than fresh water? It's true! Because it has so much dissolved salt, about 35 grams in every liter, it's denser.

Think of it like this: if you had a big jug of fresh water and a big jug of seawater, the seawater jug would weigh more! This extra weight helps big ships float. Also, seawater freezes at a colder temperature than fresh water, around -2 degrees Celsius (28 degrees Fahrenheit).

Brrr!

Seawater isn't just plain blue. It can look green, gray, or even brown depending on what's in it! Tiny plants and animals, like algae, can make it look green. Sometimes, sand and mud can make it look cloudy. Seawater is also a bit bubbly, but not like soda. It has a pH level that's a little bit like baking soda, not too sour and not too bitter. It's a busy, living soup!

Seawater is super important for our planet. It helps control the Earth's temperature, like a giant air conditioner! It also helps move heat around the world with ocean currents. Plus, think of all the amazing creatures that live in it – from tiny plankton to giant whales! Seawater is home to more life than anywhere else on Earth. It's a vital part of our planet's story.