Earths valcanoes
Scientists believe life originated on Earth around 3.5 to 4 billion years ago. This is based on fossil evidence of simple life forms found in rocks dating back to that time period and the presence of key molecules necessary for life in early Earth environments.
Fossilized non-seed vascular plants from the period such as ferns, horsetails, and club mosses have been identified. These plants are known for their primitive reproductive structures and lack of seeds, reproducing via spores instead. Fossil evidence of these plants help scientists understand the evolution of plant life on Earth.
There is ample evidence of a common ancestor for all life on Earth, known as the Last Universal Common Ancestor (LUCA). This is supported by various lines of evidence, including genetic similarities, shared biochemical pathways, and the universal presence of certain biomolecules across diverse species.
The evidence for evolution is extensive and multi-layered, too much for me to cover comprehensively. The Wikipedia article 'Evidence of common descent' has many subcategories. these are: Evidence from genetics Evidence from palaeontology Evidence from comparative anatomy Evidence from geographical distribution Evidence from comparative physiology and biochemistry Evidence from antibiotic and pesticide resistance Evidence from complex iteration Evidence from observed speciation and adaptation Evidence from intraspecies modifications I would recommend the Wikipeidia article and I am sure there are a large number of YouTube videos dedicated to the subject.
Scientists study a variety of evidence to understand the evolution of life on Earth, including fossil records, comparative anatomy, molecular biology, and biogeography. By examining how organisms have changed over time and how they are related to one another, scientists can piece together the evolutionary history of life on our planet.
Earths valcanoes
The lack of evidence of the period of heavy bombardment on Earth can be attributed to erosion, tectonic plate activity, volcanic activity, and the geological processes that constantly reshape the Earth's surface over time. These processes can bury, distort, or erase the impact craters and other evidence of the period of heavy bombardment. Additionally, the Earth's dynamic nature and the recycling of its crust through plate tectonics have further obscured the remnants of this early bombardment period.
Earths volcanoes;)
Earths volcanoes;)
Weathering, plate movements and volcanoes destroyed many of the craters
Weathering, plate movements, and volcanoes destroyed many of the craters. The factors contribute to the lack of evidence of heavy bombardment of earth. This evidence was subducted or, if not subducted, weathered; since Earth was and still is a "living" planet, meaning a planet with active plate tectonics and an active hydro/atmosphere. This activity is in contrast to the Moon, where plate tectonics stopped shortly after its formation and where a hydro/atmosphere could never form. Both because the Moon was simply too small (and thus too light) to sustain plate tectonics and to keep volatiles with him/her.
The lack of evidence of the period of heavy bombardment on Earth is primarily attributed to geological processes like erosion, plate tectonics, and the presence of water that have erased or altered much of the early Earth's surface. Additionally, the constant recycling of Earth's crust through processes like subduction has also contributed to the limited preservation of impact structures from that period.
Weathering, plate movements, and volcanoes destroyed many of the craters. The factors contribute to the lack of evidence of heavy bombardment of earth. This evidence was subducted or, if not subducted, weathered; since Earth was and still is a "living" planet, meaning a planet with active plate tectonics and an active hydro/atmosphere. This activity is in contrast to the Moon, where plate tectonics stopped shortly after its formation and where a hydro/atmosphere could never form. Both because the Moon was simply too small (and thus too light) to sustain plate tectonics and to keep volatiles with him/her.
The heavy bombardment period occurred early in Earth's history, about 4 billion years ago. Since then, geological processes like erosion, volcanism, and plate tectonics have erased much of the evidence of impact craters. Additionally, the Earth's atmosphere and active geology may have also contributed to the reduced visibility of impact scars from that time.
The lack of evidence of the period of heavy bombardment on Earth is primarily due to the dynamic nature of our planet's surface, which has been reshaped by processes such as erosion, plate tectonics, and volcanic activity. Additionally, Earth's geological activity has continuously recycled its surface through processes like melting and subduction, further obscuring ancient impact craters.
Weathering, plate movements and volcanoes destroyed many of the craters
The heavy bombardment period, known as the Late Heavy Bombardment, is estimated to have occurred about 4.1 to 3.8 billion years ago. This period was characterized by intense asteroid and comet impacts on the inner planets of the solar system, including Earth.