ask a geologist: impact craters · tunguska event -1908 ask a geologist series. recent events...
TRANSCRIPT
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Ask a Geologist:Impact Craters
By: Evan Bjonnes
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About Me
Evan Bjonnes● Pet-parent to a dog (Mr. Pibb) and
a cat (Tater Tot)● I use computers to understand
how impact craters form on different planets and moons
Ask A Geologist Series
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About Me
Ask A Geologist Series
Evan Bjonnes● Pet-parent to a dog (Mr. Pibb) and
a cat (Tater Tot)● I use computers to understand
how impact craters form on different planets and moons
● My favorite mineral is Celestine
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Meteorites
Ask A Geologist Series
● Meteorites are how space materials come to Earth
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Meteorites
Ask A Geologist Series
● Meteorites look like shooting stars because of our atmosphere
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Meteorites
● Traveling through the atmosphere burns the outside of a meteorite
Ask A Geologist Series
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Meteorites
Ask A Geologist Series
From the Smithsonian National Museum of Natural History
● We study meteorites to learn about where they came from
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Meteorites
Ask A Geologist Series
● Some meteorites have beautiful patterns inside
Widmanstätten Pattern
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Meteorites
Ask A Geologist Series
● Some meteorites have beautiful patterns inside
Pallasite
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Impacts!
● Objects hitting at a high speeds –Impact Cratering!
Ask A Geologist Series
This impact is not fast enough to form an
impact crater
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Types of Craters
● Micro Impacts● Very small craters!
Ask A Geologist Series
Destroyed Solar Panel
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Types of Craters
● Simple Craters
Ask A Geologist Series
Meteor Crater,Arizona
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Types of Craters
Ask A Geologist Series
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Types of Craters
Ask A Geologist Series
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Types of Craters
Ask A Geologist Series
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Types of Craters
● Meteor Crater● Simple Crater in
Arizona● School-bus sized
meteorite!
Ask A Geologist Series
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Types of Craters
● Complex Craters● Uplifted peak in the
center
Ask A Geologist Series
Tycho Crater,The Moon
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Types of Craters
● Complex Craters
Ask A Geologist Series
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Types of Craters
● Peak Ring Craters
Ask A Geologist Series
Schrödinger Crater,The Moon
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Types of Craters
Ask A Geologist Series
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Types of Craters
Ask A Geologist Series
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Types of Craters
Ask A Geologist Series
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Types of Craters
Ask A Geologist Series
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Types of Craters
● Multiring Basins
Ask A Geologist Series
Orientale Basin,The Moon
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Ongoing Questions
● How do the largest impact basins form?
● How does the type of material affect an impact?
● How does a crater evolve after it forms?
Ask A Geologist Series
Orientale Basin,The Moon
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Why Do We Care?
● We only have 1 Solar System!● Studying impacts helps us
understand how our planet and Solar System grew
● Impacts affect manyparts of geologicevolution
Ask A Geologist Series
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Recent Events
● Airbursts● Tunguska
Event - 1908
Ask A Geologist Series
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Recent Events
● Airbursts● Tunguska
Event - 1908
Ask A Geologist Series
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Recent Events
● Airbursts● Chelyabinsk
Event –2013!
Ask A Geologist Series
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Question Time!
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My Interests
● I use computer models to understand how very large impact craters form
● Make models of the Moon, Jupiter’s moons, and Venus
Ask A Geologist Series
Valhalla BasinCallisto
Jupiter’s Moon