This is the Natural History Museum at the Daejeon Campus of Chungnam National University in Daejeon.

This is the Daejeon Metropolitan City Chungnam National University Daedeok Campus Natural History Museum. The Birth of the Earth About 4.6 billion years ago, as the primitive sun was formed, asteroids orbiting it were created, and they collided with each other and merged to form the primitive Earth. The primitive Earth became very hot due to radioactive isotope decay, asteroid collisions, and gravitational energy, and everything melted and became a magma ocean. At this time, dense elements such as iron sank, and elements with low density such as silicon rose and separated into the core and mantle. As asteroid collisions decreased, the temperature of the Earth gradually decreased, and the outer part cooled, forming a primitive crust. A primitive atmosphere composed of water vapor, methane, carbon dioxide, and ammonia was formed, and later, the water vapor cooled and fell as rain, forming a primitive ocean. Rocks on Earth are largely divided into sedimentary rocks, igneous rocks, and metamorphic rocks. Sedimentation includes clastic sedimentary rocks, which are formed after existing rocks are weathered, eroded, and deposited, and nonclastic sedimentary rocks, which are formed through chemical and organic processes. Igneous rocks are rocks formed when magma cools, and are classified into volcanic rocks and plutonic rocks depending on their formation form. Metamorphic rocks are rocks formed when parent rocks undergo metamorphism, and changes such as foliation or recrystallization of existing crystals occur during the metamorphic process. Igneous rocks are formed by the crystallization of magma inside the Earth, and rocks exposed to the surface undergo weathering, erosion, transport, and sedimentation to form sedimentary rocks. In addition, when the formed rocks are exposed to heat and pressure, their properties change and they become metamorphic rocks. The rocks of the Earth constantly repeat this process to form new rocks. Forests are a community of life where the order of life has been stably established for a long time in a natural state, and are a treasure trove of biodiversity where 70% of all living things on Earth, including trees, grass, insects, microorganisms, and wild animals, live. Structure of Wood Wood has been used since the beginning of human history. It is one of the most closely related resources to humans, especially for construction, fire making, furniture, and household goods. When looking at the cross section of this wood, it is composed of bark, sapwood, and heartwood. Since the growth rate of wood varies depending on environmental factors, it forms rings, and when cut horizontally, the rings show concentric circles, and one ring is formed per year, which allows us to determine the age of the tree. Economic Value of Forest Resources The world's forests cover 31% of the Earth's surface area, and they are habitats for life on Earth, providing resources for food, clothing, shelter, and ecosystem services that provide cultural, recreational, healing, and spiritual values. Forests have economic effects in addition to the production of wood, and most of them are public property. Looking at forest resources from the economic perspective of forests, they can be divided as follows: Endemic Plants A valuable plant resource that has adapted and evolved to the natural environment of the Korean Peninsula and grows indigenously, and currently, about 400 species live in Korea. The Convention on Biological Diversity was established in Rio in 1992, and the Nagoya Protocol on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits Arising from Their Utilization was adopted in October 2010, emphasizing the importance of strategies to conserve useful resource plants related to Korean endemic plants. Rare plants This includes endangered plants, protected plants, declining species, specific plants, and legally protected plants, and refers to plants in their natural habitats that need to be protected, especially plants whose population size is extremely small or has decreased and therefore requires conservation. The International Union for Conservation of Nature (IUCN) has established evaluation criteria for the list of rare plants (classified as extinct, extinct in the wild, endangered species, endangered species, vulnerable species, under-reported species, and data-insufficient species). Distribution of seaweed in the intertidal zone and subtidal zone The area where seaweed is distributed is divided into the intertidal zone and subtidal zone. The intertidal zone is between the highest and lowest water levels, and is periodically submerged in water and then exposed to the air. In the case of the west coast, the upper intertidal zone is covered with baby's breath and rock beard, the middle intertidal zone is covered with squid, squid, and snails, and the lower intertidal zone is covered with purple snails, snails, and small corals. Grows. In the subtidal zone, sea squirts and shrimp grow. In the southern coast, sea squirts are dominant in the subtidal zone, and in the eastern coast, sea kelp is dominant, forming a sea forest and providing a habitat for many marine life. #Domestic travel #Travel plan #February travel subsidy event