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Questions and Answers
What caused the features listed in the Earth Impact Database?
What caused the features listed in the Earth Impact Database?
- Tectonic plate movement
- Collision of meteors or comets with the Earth (correct)
- Erosion and weathering
- Volcanic activity
How is the diameter of eroded or buried craters typically stated?
How is the diameter of eroded or buried craters typically stated?
- Current surface features
- Volume of the crater
- Best available estimate of the original rim diameter (correct)
- Depth from the surface to the center
What are the time units used to measure the age of impact craters?
What are the time units used to measure the age of impact craters?
- ka (thousands) or Ma (millions) of years (correct)
- Decades or centuries
- Hours or days
- Minutes or seconds
How old are craters categorized as '10 ka or less'?
How old are craters categorized as '10 ka or less'?
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What are the largest craters within a time period included in the list?
What are the largest craters within a time period included in the list?
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Study Notes
Impact Craters
- Features listed in the Earth Impact Database are caused by meteorite or asteroid impacts on the Earth's surface.
Crater Diameter Measurement
- The diameter of eroded or buried craters is typically stated as the original diameter, which is estimated based on geological evidence.
Age of Impact Craters
- The age of impact craters is measured in time units such as ka (kiloannum, or thousand years), Ma (megaannum, or million years), and Ga (gigaannum, or billion years).
Crater Age Categories
- Craters categorized as '10 ka or less' are less than 10,000 years old, indicating that they are relatively young and well-preserved.
Largest Craters by Time Period
- The largest craters within a time period are included in the list, providing a representation of the most significant impacts that have occurred on the Earth's surface over time.
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