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Earthquake: A violent shaking of the earth, usually due to movements of tectonic plates under the earth’s crust.
Seismometer: An instrument that detects changes in the up-down motion of the earth.
Seismic body waves: Higher frequency waves released by earthquakes that can move through solid rock.
Seismic surface waves: Lower frequency waves released by earthquakes that move along the ground and cause most damage.
Earthquake Early Warning System: A network of strategically placed seismometers that trigger emergency warning systems in particular areas when they detect large seismic body waves.
Evacuation Clearance Time: The time needed to evacuate a particular population to safety.
Earthquake Precursor: An anomalous event that gives an effective warning of an impending earthquake.
Transform Faults: Faults where two tectonic plates slide past each other.
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4:11
Black Bears
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1:17
Let’s Categorize Bears
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1:19
Why Are Your Fingerprints Unique?
To learn more about this topic, start your googling with these keywords:
Fingerprint: The markings on the skin on the last joint of the thumb or finger.
Fingerprint Ridges: The raised lines on the fingerprint.
Fingerprint Pattern: The main design in the middle of the fingerprint; usually a loop, whorl, or arch.
Volar Pad: The mass of stem cells that grows under the fingers during a particular time during fetal development that is responsible for determining the pattern of the fingerprint.
Fingerprint Minutiae: The various tiny points in each fingertip where the ridgelines get blocked or split.
Compound Probability: The likelihood that independent events will occur simultaneously.
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3:33
The Bird Poop That Changed The World
To learn more about this topic, start your googling with these keywords:
Guano: seabird (or bat) poop. From the indigenous Peruvian word “wanu”, meaning “manure that’s good for fertilizer"
Manure: animal poop used as fertilizer (typically cow or pig poop)
Fertilizer: a chemical-containing substance added to soil to provide nutrients to plants
Nitrate mining: digging up the naturally occurring solid form of the element nitrogen (sodium nitrate)
Phosphate mining: digging up the naturally occurring solid form of the element phosphorus
Haber-Bosch process: the major industrial method to take nitrogen gas out of the air and convert it to ammonia
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From the creators of the popular science show with millions of YouTube subscribers comes the MinuteEarth podcast. Every episode of the show dives deep into a science question you might not even know you had - but once you hear the answer, you’ll want to share it with everyone you know. Our team of scientists digs into the research and breaks it down into a short, entertaining explanation jam-packed with science facts and terrible puns. We’ll tell the incredible story of how monkeys crossed the Atlantic ocean on natural rafts, and we’ll explain why it gets hotter the deeper you dig underground.
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