What is a sticky shell? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

What is a sticky shell? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

What is a sticky shell?

If you have ever been to the sea and walked near breakwaters, boulders, protective walls, then you probably saw shells that stuck. That "crust" that you probably noticed on breakwaters and boulders consists of many millions of shells stuck.

A sticky shell is just a small mollusk. When they are born, they are free-floating. But, having reached the adult state, they no longer move, but attach themselves to any suitable surface and completely lose their ability to move. Since they tend to cling not one by one, but in millions, they are a serious hindrance to a person.

For example, when these shells form a crust on a ship's hull, they can cut its speed in half! In the old days, when the ships were very small, shells were a real danger, made it difficult to control the ship and could even delay it and not allow it to arrive at the port at the appointed time. Pirates who sailed in the Caribbean were forced to capsize their ships on the shore and clean off shells.

Whalers of old times had great difficulty returning home after a two-year voyage because of the huge quantities of shells stuck to the hull of the ship. Even in our time of modern, powerful ships, shipping throughout the world suffers huge losses due to shells, which cause loss of time and increase wear on propulsion systems.

There are many varieties of sticky shells, among which there are shells that prefer to live on rocks rather than on wood and metal. As we have already said, only when they are born, they resemble small crabs or lobsters and can move around. But as soon as the shell attaches to any surface, it already remains there for life!

At the attached shell, the shell continues to grow, which completely covers its body. In this case, her tentacles or antennae remain the only movable organ. She has six pairs of these tentacles, with which she is able to move in order to reach out to some small marine organisms and draw them to her.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

The title of which Rembrandt painting is the opposite of the artist's intent?

Painted in 1642, Rembrandt's "Speech of the rifle company of Captain Frans Banning Cock and Lieutenant Willem van Ruytenburg" eventually became better known as "Night Watch". However, during the restoration of the canvas in 1947, it turned out that the word "night" is not very appropriate here. Rembrandt covered the painting with several layers of dark varnish, and over the long years of being in the Amsterdam City Hall, she also became a victim of soot from the fireplace. The cleaning of the canvas, coupled with the analysis of the shadows from the characters, showed that the action takes place between noon and two in the afternoon.

Test your knowledge! Did you know...

▪ Why can't we feel the Earth's rotation?

▪ How do condensation bands form?

▪ What alphabet do the Mongols use?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Wheat and peas will grow faster 15.01.2018

Researchers from the English Research Institute in Norwich, the universities of Queensland and Sydney have developed a technology for accelerated crossing of plants. Scientists and engineers have reduced the life span of one generation of plants, from seed to seed, to eight weeks. This breeding rate allows for up to six experimental crops per year; this is three times more than usual.

Why plant growth is important, explains study leader Brande Wulff: "A crowded planet needs large yields and disease and pest resistant crops. The faster we can test new varieties, the faster we can give farmers new, better crops." ".

Plants grown using the accelerated method look just as good as normal plants and produce as many seeds as those grown in the usual time frame. New varieties of agricultural plants bred using accelerated crossbreeding technology will be on the market in 10 years, Wolf said.

In greenhouses for accelerated crossing, light is 22 hours; additional lighting after sunset and even at noon is provided by economical LEDs. Room settings. such as humidity and temperature are monitored at all times by a system of sensors and regulators. To date, the authors of the study, published in Nature Plants, have managed to harvest six crops a year of the following crops: wheat, durum (durum "pasta" wheat), barley, beans and peas.

Other interesting news:

▪ Less and less laptops are being bought

▪ Harm of gas stoves

▪ Tired of your own thoughts

▪ Super strong rayon

▪ Cats are hunting

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Palindromes. Article selection

▪ article The Tale of the White Bull. Popular expression

▪ article What future awaits our luminary - the Sun? Detailed answer

▪ article Laboratory work using computer video display terminals. Standard instruction on labor protection

▪ article Outgoing call time counter. Encyclopedia of radio electronics and electrical engineering

▪ article Experiments with invisible axes. physical experiment

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews