Nitrogen, water vapor, carbon dioxide, and methane
What is Which gases were probably most abundant in earth's early atmosphere
100
Alfred Wegener
What is Who proposed the concept of continental drift
100
a weak spot in the crust where molten materiel reaches earth's surface
What is a volcano
100
plates are sections of earth's lithosphere
What is plates?
200
Radioactive dating of rocks from Earth and the moon
What is the process by which scientists determined the age of earth
200
they placed water and a mixture of gases representing early earth's atmosphere, then they sent an electric current through the mixture to simulate lightening
What is How did Miller and Urey model the conditions in earth's early atmosphere
200
the continents would have gradually separated to their current positions
What is the hypothesis of continental drift, how would a world map changed over the last 250 million years
200
at converging and diverging plate boundaries
What is where are most volcanoes located
200
a theory that explains the formation, movement, and subduction of earth's plates
What is the theory of plate tectonics
300
Oceans, atmosphere and the continents
What is a physical features formed during earth's first several hundred million year's
300
the chemical building blocks of life can form under the conditions of early earth
What is inferred from the results of Miller and Urey's experiment
300
similar fossils occur on different continents. many of the organisms could have not crossed the ocean
What is how did fossils provide evidence for continental drift
300
the crust is fractured allowing magma to reach the surface
What is causes volcanoes to form at a diverging plate boundary
300
convection currents in earth's mantle
What do scientists think causes the movement of earth's plates
400
They replaced carbon dioxide and water vapor into the atmosphere
What is how the volcanic eruptions and comets change early earth
400
Later experiments that succeeded in producing chemical units that make up carbohydrates and nucleic acids.
What is experiments it addition to Miller and Urey's helped scientist hypothesize about how life arose in earth
400
they could not identify a mechanism by which the continents could move
What is why did most scientists reject Wegener's hypothesis of continental drift
400
an area where material rises from deep within the mantle and melts to form magma
What is a hot spot
400
convergent, divergent, transform
What are three types of plate boundaries
500
bacteria -like organisms
What is scientist think were the first organisms to evolve on earth
500
the archaea that live in extreme conditions of hot springs today are probably similar to the first cells that lived in the extreme conditions of early earth
What is how is the existence of organisms in hot springs today consistent with the scientific hypothesis of how life forms arose on earth
500
a continent moving toward the equator would become warmer and one moving toward the poles will become colder
What is How would continental drift affect a continent's climate
500
through time lava flows to the surface and forms new rock. the layers of rock accumulate to form a volcano
What is how does a hot spot volcano form
500
the oceanic plate will subduct beneath the continental plate
What is likely to occur at a plate boundary where oceanic crust collides with continental crust