What famous paleogeographic feature was located in eastern margin of utah and most of colorado during the cretaceous period associated with limestone and coal deposition?
interior seaway
uplift of the rocky mountains
oceanic subduction
melting of the glaciers
labrador seaway
in contrast to darwin's ideas, curvier explained extinction and fossils with
lowering sea-level due to melting glaciers.
catastrophic floods.
gradual evolutionary change over time.
tectonic uplift of the alps.
how did reptiles evolve from fish?
lobe-fined fish evolved to amphibians then reptiles with the amniotic egg.
amphibians evolved to lobe-fined fish then reptiles with the amniotic egg.
ray-fined fish evolved to amphibians with features.
ray-fined fish evolved to reptiles with the amniotic egg, then they evolved back into the water as amphibians.
what are the two main pieces of evidence (one chemical and one biological) suggesting that a collision with a large object like a giant meteorite caused the k-pg boundary mass extinction that killed off the dinosaurs?
soils devoid of life and a sterile chemical signature.
high uranium concentrations and low ph of soil.
iridium and the disappearance of fossils above the layer.
sterile chemical signature, shocked quartz, and deformed dinosaur bones.
if stress are the forces applied to a rock, then strain is
the deformation of the rock
the increase of stress
the melting of the rock under intense metamorphism
the decrease of stress