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100 Greatest Discoveries, with Bill Nye | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions
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100 Greatest Discoveries, with Bill Nye | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions

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  • August 7, 2024
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100 Greatest Discoveries, with Bill Nye | Questions & Answers (100 %Score) Latest
Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions


Mount Saint Helens - an active volcano in the Cascade Range in southwestern Washington that suddenly
erupted in 1980 that was inactive circa 130 years.



seismographs - a tool used to study earthquakes, their use triggered a better understanding of Earth's
interior



crust - a skin of rock covering the planet, the first layer of earth



mantle - begins about 6 miles under the ocean's crust and 19 miles below the continent's crust, the
second layer of earth



outer core - a layer of molten iron and nickel that surrounds the inner core of Earth



inner core - a dense sphere of solid iron and nickel at the center of Earth



Inge Lehman - a Danish seismologist who discovered the earth's inner core



Richard Dixon Oldham - a British geologist who made the first clear identification of the separate arrivals
of P-waves, S-waves and surface waves on seismograms and the first clear evidence that the Earth has a
central core



Alfred Wegener - a German polar researcher, geophysicist and meteorologist who was primarily known
for his achievements in meteorology and as a pioneer of polar research, but today he is most
remembered as the originator of the theory of continental drift by hypothesizing in 1912 that the
continents are slowly drifting around the Earth



Pangaea - a supercontinent that existed during the late Paleozoic and early Mesozoic eras; proposed by
Alfred Wegener

, continental drift - the movement of the Earth's continents relative to each other, thus appearing to
"drift" across the ocean bed



sonar - sound navigation and ranging



Harry Hammond Hess - a geologist and United States Navy officer in World War II, one of the "founding
fathers" of the unifying theory of plate tectonics, best known for his theories on sea floor spreading,
specifically work on relationships between island arcs, seafloor gravity anomalies, and serpentinized
peridotite, suggesting that the convection of the Earth's mantle was the driving force behind this
process



World War II - a war fought in Europe, Africa and Asia between the Allied Powers of Great Britain,
France, the Soviet Union, and the United States against the Axis Powers of Germany, Italy, and Japan



sea-floor spreading - the process by which molten material adds new oceanic crust to the ocean floor



oceanography - study of Earth's oceans



Mid-Atlantic Ridge - large divergent boundary in the middle of the Atlantic Ocean, reason for sea floor
spreading, located with a huge volcanic mountain range



volcano - a weak spot in the crust where magma has come to the surface; the Mid-Atlantic ridge is filled
with them



subduction - a geological process in which one edge of a crustal plate is forced sideways and downward
into the mantle below another plate



theory of plate tectonics - the theory that pieces of Earth's lithosphere are in constant motion, driven by
convection currents in the mantle



tectonic plates - large movable plates under the Earth's surface, in the lithosphere

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