I believe this refers to the Navy that serves in the Ocean as opposed to navy ships and personel that served on in-land rivers and waters.
When you look into an ocean or a lake, the water looks like it's blue. But, up close, water isn't really blue. It's only blue when you look at it in big groups, (like an ocean or a lake, a pond etc.), because the sky is blue, so the color of the sky makes a blue reflection on the water, making it look blue. So, on a map, if you drew water as clear, nobody would be able to tell there was anything there at all! So, water on a map is drawn blue instead.
The depth of the Blue Lake in Mount Gambier is approximately 77 meters (253 feet). The Blue Lake is a volcanic crater lake formed in the crater of the Mount Gambier volcano.
Crater Lake in Oregon is an example of a caldera lake, which is a lake that forms in the depression of a volcano's collapsed magma chamber. It is unique because it is the deepest lake in the United States and known for its exceptionally blue and clear water.
A volcano crater filled with water---CALDERA
This is the water cycle.
The blue appearance of a lake is the result of the reflection of a blue sky on the water's surface. A jar of water indoors does not have a blue reflection from the sky and therefore does not have a blue color.
The greenish blue color of a lake can be due to the presence of algae or phytoplankton in the water. These microscopic organisms contain pigments that give the water a greenish hue. Additionally, the reflection of the sky and surrounding vegetation can also contribute to the blue color of the water.
A blue line on a map is a lake ,river , or body of water
usually Lahontan cutthroats, carps, blue gill
There is no definitive count of blue water lakes in the world, as the term "blue water lake" can refer to various bodies of water known for their striking blue color due to factors like depth, purity, and mineral content. Notable examples include Lake Tahoe in the United States, Lake Louise in Canada, and the Blue Lake in New Zealand. Each region has its own unique lakes that may be considered blue, but the total number is not officially documented.
The glaciers at the head of the valley which are the source of Lake Louise's water grind up the limestone into a fine glacial silt known as "rockflour". This flows into the lake and makes it look blue.
The address of the Blue Lake Library is: 111 Greenwood Ave., Blue Lake, 95525 4960
The address of the Blue Lake Museum is: Po Box 707, Blue Lake, CA 95525
a blue line on a map means that it is water weather it is a stream river or lake
The Blue Nile, a river originating at Lake Tana in Ethiopia.
When you look into an ocean or a lake, the water looks like it's blue. But, up close, water isn't really blue. It's only blue when you look at it in big groups, (like an ocean or a lake, a pond etc.), because the sky is blue, so the color of the sky makes a blue reflection on the water, making it look blue. So, on a map, if you drew water as clear, nobody would be able to tell there was anything there at all! So, water on a map is drawn blue instead.
The web address of the Blue Lake Museum is: http://www.bluelakemuseum.org/