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Two points here: rocks are solidified material--early Earth was molten. The first rocks appeared after the molten Earth cooled somewhat. Secondly, Earth's rocks are constantly being recycled through the 'rock cycle'. The oldest rocks on Earth have somehow survived those recycling efforts, but no rock found on Earth (other than some meteorites) is as old as the planet.
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Why sedimentary rocks could not have been the first rocks on earth?
Sedimentary rocks form from the accumulation of sediment such as sand, silt, or clay. For sedimentary rocks to form, there must be pre-existing rocks that weather and erode to produce sediment. Therefore, sedimentary rocks could not have been the first rocks on Earth as they require the presence of older rocks to form.
What evidence supports the hypothesis that Earth is 4.6 billion years?
The age of Earth is determined through radiometric dating of rocks and meteorites, as well as studying the decay of radioactive elements, such as uranium and thorium, in Earth's crust. Additionally, analysis of lunar rocks from the Apollo missions provided further evidence supporting the estimated age of Earth at 4.6 billion years.
What is the current age of the earth?
The Earth is estimated to be approximately 4.5 billion years old. This age is calculated based on radiometric dating of meteorite material and rocks from the Earth's surface.
Rocks buried deep underground must do what before they are weathered or eroded?
Rocks buried deep underground must be uplifted to the surface before they can be weathered or eroded. This uplift can happen through tectonic movements, erosion of overlying rocks, or other geological processes that bring the rocks closer to the Earth's surface. Once at the surface, rocks are exposed to weathering processes such as wind, water, and ice that break them down over time.
In order to form magma what must happen to sedimentary metamorphic or igneous rocks?
In order to form magma, sedimentary, metamorphic, or igneous rocks must be exposed to high temperatures and pressures deep within the Earth's crust. This process causes the rocks to partially melt, forming molten rock called magma.
