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Impact location. Earth and Planetary Science Letters. Earth Impact Database. Retrieved 15 September United States Geological Society.

Chesapeake Invader : Discovering America's Giant Meteorite Crater - tyruvyvizo.cf

Retrieved 5 March Insight from numerical modeling". Bibcode : Geo National Geographic. National Geographic Society. Retrieved 1 July Bibcode : Sci Berlin, Germany: Springer-Verlag : 69—93,.


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Retrieved 7 October Bibcode : Natur. Koch Impact cratering on Earth.

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Impact crater Impact event. Authority control GND : Namespaces Article Talk.

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Views Read Edit View history. In other projects Wikimedia Commons. By using this site, you agree to the Terms of Use and Privacy Policy. Location of impact site in relation to the United States. L chondrite [1].

CHAPTER FIVE. Super Tsunami

Impact location Location of impact site in Virginia. Route 13 to S.


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As the summer wore on, more individual rapa whelks were spotted in the bay. Then in August, the researchers found a distinctive lemon-yellow egg mass in the James River estuary.

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They reared it in the lab, and over the span of a few weeks, hundreds of rapa whelk larvae hatched from the egg cases. The invasion, it seemed, was well underway. While relatively new to the Chesapeake, the rapa whelk has a long history of invading new territory. From its native waters around Korea and Japan, this predatory mollusk has spread to the Black, Aegean, Adriatic, and Mediterranean Seas in the last century. Scientists believe it reached the Chesapeake by hitching a ride across the Atlantic, probably as larvae in a ship's ballast water.

The snail's ability to hopscotch around has scientists worried that it could spread along the Eastern Seaboard, possibly as far as South Carolina and Massachusetts.

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Whelks prey on clams, oysters, and other shellfish and pose a threat to the Chesapeake clam fishery. They may also compete with the bay's native species, such as indigenous knobbed and channeled whelks, and their lifecycle gives them some advantages over the locals. While the bay's native snails begin life on the ground, rapa whelks hatch as swimming larvae that settle to the ground after a few weeks. This allows them to travel in ballast water , evade some predators, and swim or ride the currents away from where they hatched.

Real World: NASA and the Chesapeake Bay

Once they do settle, rapa whelks grow their thick shells quickly, giving them more protection from predators than some native species.