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2 天前 · The atmosphere of Earth is the planetary atmosphere of Earth, composed of a layer of gas mixture that surrounds the Earth's planetary surface (both lands and oceans ), known collectively as air, with variable quantities of suspended aerosols and particulates (which create weather features such as clouds and hazes ), all retained by Earth's gravity.
1 天前 · The history of Earth concerns the development of planet Earth from its formation to the present day. [1] [2] Nearly all branches of natural science have contributed to understanding of the main events of Earth's past, characterized by constant geological change and biological evolution .
1 天前 · The Maldives is the lowest country in the world, with maximum and average natural ground levels of only 2.4 metres (7 ft 10 in) and 1.5 metres (4 ft 11 in) above sea level, respectively. In areas where construction exists, however, this has been increased to several metres.
6 天前 · 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [1]
4 天前 · Demographics of the world - Wikipedia. Earth has a human population of over 8 billion as of 2024, with an overall population density of 50 people per km 2 (130 per sq. mile). Nearly 60% of the world's population lives in Asia, with almost 2.8 billion in the countries of India and China combined.
2 天前 · Methodology The life expectancy is shown separately for males and for females, as well as a combined figure. Several non-sovereign entities and territories are also included in this list.The figures reflect the quality of healthcare in the countries listed as well as other factors including HIV infections. ...
2 天前 · Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. [2] . Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates.
