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This is the Gwacheon National Science Museum in southern Gyeonggi Province.
Aquatic animals are all animals that live in the water, including not only animals that evolved in the sea and have never been underwater, but also animals that came up to land and then lived underwater again.
There are about 4,000 large and small rivers flowing through the Korean Peninsula, and there are seas in the East, West, and South Seas with different characteristics depending on the location. It is known that about 9,000 species of creatures are distributed in the oceans of the Korean Peninsula.
Fish in rivers and lakes in Korea
Downstream
Since the river neck is completely wide and flows straight into the sea without any bends, it is directly or indirectly affected by seawater and has a water reflection.
The bottom is mostly sandy, but the bottom is muddy at the estuary. Carp, crucian carp, loach, and makuri, which are resistant to salt, live in the downstream of the river.
Middle
The river is wide and has a large flow, and there are small pebbles and sand and mud bottoms, so it flows slowly.
In the middle of the river, there are many kinds of fish, such as the most common pyramid and galgeonni in Korean rivers, as well as crucian carp and smelt.
Upstream
The upper part of the river, where the river begins, has deep pools, and the water curves in a figure 8 shape, so the current is very fast and there are long rapids with rocks and pebbles. In the upper part of the river, there are shiri, eoreumchi, jikji, and sogari.
Habitat of marine fish
The average depth of the East Sea is 1,543m, and the cold North Korean Current coming down from the north of Gimgo along the coast and the East Korean Warm Current coming up from the south meet and mix in the central region, forming a golden fishing ground.
The West Sea has an average depth of 44n, and the tidal difference is large. While the warm Yellow Sea Current flows, there is a cold water zone in the center, so fish species that live in cold waters can live there. It also has the world's largest tidal flat.
The South Sea maintains a tropical climate due to the influence of the Tsushima Current, a tributary of the Kuroshio Current, and coastal waters with low water temperatures develop in the winter. Therefore, various species appear due to creatures that adapt to the four seasons and creatures that seek out warm seas.
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The four main forces acting on an airplane
Gravity: The force that pulls the airplane toward the ground.
Lift: The force that opposes gravity and is created by the wings of the airplane. The airplane can only fly if there is lift.
Propulsion: The force created by the airplane engine or propeller. When the speed of the airplane increases, the wings create lift.
Air resistance: The force that opposes the propulsion force and slows down the movement of the airplane.
Hypersonic jets are aircraft that can fly at 5-15 times the speed of sound, and can reach the other side of the Earth in just 2 hours at a speed of over 5,000 km/h.
The Boeing 787 Dreamliner, made entirely of composite materials, is a mid-sized passenger aircraft that boasts a specific fuel consumption rate that is about 20% lower than competing aircraft. It boasts a wider interior than any other mid-sized passenger aircraft, and provides passengers with a comfortable flight through wider seats and aisles.
The Airbus A380 can accommodate 33% more passengers than its competitor, the Boeing 747-400. Based on the existing 3-class seating arrangement, 525 seats can be arranged, and up to 853 seats can be arranged based on economy class seats.
With the construction of the Naro Space Center, our country has become the 13th country in the world to have a space base. In 1967, the 'Outer Space Treaty' and in 1972, the 'Outer Space Liability Treaty' came into effect. In 2008, the Space Damage Compensation Act was enacted and implemented in Korea.
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Korean civilization pursued a Confucian ideal state based on science and technology such as writing, printing, astronomy, geography, military technology, agriculture, and medicine.
Hunminjeongeum is a scientific, integrated, and systematic writing system. It contributes to strengthening and maintaining the identity and unity of our people. It fits the purpose of Hunminjeongeum, which is to correct writing and gather the power of the people.
The Joseon Dynasty carried out activities such as isolating patients, personal hygiene and education, providing medicine and food, strengthening management education and supervision, medical treatment and treatment, and gathering public sentiment. While dispatching doctors to the relevant regions and devising treatment methods, it also quickly distributed effective treatments when discovered.
In the morning, time was measured with a sundial like a yangbuilgu, but on a cloudy night or at night, time was measured with a water clock or star clock. A water clock with an automatic time-telling device was called a jaegakru. It was used as a national standard clock by adding a time-telling function to the time-measuring function.
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