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What evidence do planetary geologists have to go on to determine the geology of the inner planets? On Earth, scientists can collect and analyze the chemistry of samples, do radiometric dating to determine their ages, and look at satellite images to see large-scale features. Rovers have landed on Mars and sent back enormous amounts of information but much of the rest of what is known about the inner planets is from satellite images. This composite shows the relative sizes of the four inner planets. From left to right, they are Mercury, Venus, Earth, and Mars. Unlike the outer planets, which have many of satellites, Mercury and Venus do not have moons, Earth has one, and Mars has two.
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2. Absolute age dating | Digital Atlas of Ancient Life

Geology can also include the study of the solid features of any terrestrial planet or natural satellite such as Mars or the Moon. Modern geology significantly overlaps all other Earth sciences, including hydrology and the atmospheric sciences , and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. Geology provides the primary evidence for plate tectonics , the evolutionary history of life , and the Earth's past climates. Geologists use a wide variety of methods to understand the Earth's structure and evolution, including field work , rock description , geophysical techniques , chemical analysis , physical experiments , and numerical modelling.
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How Do Scientists Determine the Age of Dinosaur Bones?

The Chuska Mountains are an elongate range on the southeast Colorado Plateau and within the Navajo Nation whose highest elevations approach 10, feet. It trends north-northwest and is crossed by the state line between Arizona and New Mexico. The highest point is Roof Butte The eastern escarpment of the mountains is marked by slumps and landslides that extend out onto the western margin of the San Juan Basin. Major peaks of the Chuskas include: [1].
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Planet Earth doesn't have a birth certificate to record its formation, which means scientists spent hundreds of years struggling to determine the age of the planet. So, just how old is Earth? By dating the rocks in Earth's ever-changing crust, as well as the rocks in Earth's neighbors, such as the moon and visiting meteorites, scientists have calculated that Earth is 4. Related: How Big is Earth? Scientists have made several attempts to date the planet over the past years.
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