In general a body of water with the word "sea" in its name probably contains salt water, but it's not an ironclad guarantee. For example, the Sea of Galilee is fresh water.
No some are freshwater
Yes, there are no freash water Oceans.
yes
Salt water is water that has salt (sodium chloride) ions dissolved in it. It is what is found in the oceans.
yes Not all salt. There are salt mines all over the world where most of our salt comes from.
the world has more salt water because the world is mostly made of oceans.
Oceans have salt water.
The oceans contain salt water because salt is an abundant mineral on earth, it is dissolved in water and washed into oceans, and, because of the way the water cycle operates, precipitation continues to wash salt into the world's oceans. That salt that ends up in the sea stays there when the water evaporates. This has been happening for millions of years, and what we see today as salty ocean water has been a characteristic of earth's oceans for about as long as liquid water has been on earth.
Salt water
oceans have salt water
The oceans are salt water, the world is 91% ocean. When the water got to rivers or lakes they were precipitated and the clouds filter the salt.
There is by far more saltwater in the world. The oceans of the world are saltwater, and by volume the oceans compose over ninety percent of Earth's water.
Around 3% of water on earth is fresh water
All oceans are salt water, the only bodies of fresh water are lakes, rivers, streams, etc.
All of the oceans cover most of our planet Earth. they cover 75% of the world!