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Updated on May 24, 2024. The Geologic Time Scale is the history of the Earth broken down into four spans of time: the Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras. These eras of the Earth are marked by various events, such as the emergence of certain species, their evolution, and their extinction, that help distinguish one era from another.
Há 16 horas · Geologic time scale. The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating ...
Há 2 dias · The Years Ago Calculator is an intuitive and straightforward online tool designed to quickly provide the exact date from a specified number of years in the past. For example, if you're wondering what the date was exactly 4 years ago from today, all you need to do is enter '4' into the calculator.
Há 1 dia · In June 2023, scientists reported evidence that the planet Earth may have formed in just three million years, much faster than the 10−100 million years thought earlier. [7] [8] The Hadean eon represents the time before a reliable (fossil) record of life; it began with the formation of the planet and ended 4.0 billion years ago.
Há 4 dias · Just a century ago, there were only 2 billion people on Earth. Today, that number has quadrupled to eight billion, making up 6.5% of the total number of people who have ever lived on our planet. It’s mind-boggling to consider the exponential growth that has occurred in such a relatively short period of time.
- Roy Johns
Há 16 horas · List of living centenarians. The following is a list of living centenarians (living people who have attained the age of at least 100 years) known for reasons other than just their longevity. For more lists of centenarians, see lists of centenarians .
Há 4 dias · Stone Age, prehistoric cultural stage, or level of human development, characterized by the creation and use of stone tools, the oldest known of which date to some 3.3 million years ago. The Stone Age is usually divided into three separate periods: Paleolithic, Mesolithic, and Neolithic.
