Why the water looks green from a distance 20

The green color of the lake is due to the abundance of algae in the water. Absorbs red-orange and blue-green light. So the light that comes out of the water is green.

Similarly, the red sea water during red tide is also caused by a red algae bloom. ）

The deeper the water, the more green light waves are reflected, and the deeper the green color appears. Green is not visible in shallow water.

Clean pure water is colorless and transparent, but clean river water, when the sunlight hits the water, there will be a part of the light waves reflected back, and in the spectrum, the green light waves will reflect more than other lights, and other colors will let the virtual reed light be absorbed by the water body more, so the human eye sees green.

Physiological significance. Water is a substance necessary for the normal metabolism of the human body, and under normal circumstances, the body has to excrete water through **, internal organs, lungs and kidneys every day to ensure that toxins are excreted from the body. Children have 80% water in their bodies, older people have 50 to 60% water, and normal middle-aged people have 70% water in their bodies.

Water has many important functions in the body:

1) Water is an important component of cell protoplasm;

2) Water acts as a solvent in the body to dissolve a variety of electrolytes;

3) Water plays a role in transporting nutrients, metabolic wastes and endocrine substances (such as hormones) in the body;

4) Water has high thermal conductivity and specific heat, which can be used as a "heat carrier" to transfer heat between the body and the surface, which helps the human body to regulate body temperature.

Because the water is not pure water, and the depth of the water is relatively large, when the thickness of the water layer exceeds 2 meters, the color of the water will change due to the refraction and reflection of light, and there are some algae and microorganisms in the water, so it appears turquoise. <

Because the water is not pure water, and the depth of the water is relatively large, when the thickness of the water layer exceeds 2 meters, the color of the water will change due to the refraction and reflection of light, and there are some algae and microorganisms in the water, so it appears turquoise.

Because the water is not pure water, and the depth of the water is relatively large, when the thickness of the water layer exceeds 2 meters, the color of the water will change due to the refraction and reflection of light, and there are some algae and microorganisms in the water, so it appears turquoise. The reflection of light makes up the electromagnetic waves of sunlight at different wavelengths, and different objects reflect electromagnetic waves of different wavelengths. It's the same as the fact that the sea is blue.

Because the water is not pure water, and the depth of the water is relatively large, when the thickness of the water layer exceeds 2 meters, the color of the water will change due to the refraction and reflection of light, and there are some algae and microorganisms in the water, so it appears turquoise. The reflection of light makes up the electromagnetic waves of sunlight at different wavelengths, and different objects reflect electromagnetic waves of different wavelengths. It's the same as the fact that the sea is blue.

It is a kind of insect called euglena, he lives in ditches and other places with water and has strong reproductive ability, the body is cylindrical or fusiform, because he has green leaf body flagella, and reproduces in large quantities in warm seasons, such as spring, summer and autumn and other winters, so that the water is green and drought-resistant, cold, poor water quality, etc., and the viability is no less than fecundity, the water is green Most likely, there are also small reasons for water quality and aquatic plants, most of them are because there are many euglena (more characteristics please ask).

LZ is to say the lake water, because there are many fish in the lake, and the fish are constantly excreted, so that the nutrients in the water increase, and the algae plant blooms, and the water turns green.

There should be several scenarios for this question:

1 The water is relatively rich in nutrients, and many algae plants grow, such as chlorella, spirala, euglena, etc., which are green;

2 There may not be a lot of algae, but the water may not be very clear, and it looks dark green and black; ......