Earth’s History Practice

Why is it important that we have a rigid lithosphere overlying a weak asthenosphere?

Why is the molten metallic outer core and the magnetic field important to life on earth?

The Goldilocks scearino suggests that

The earth formed approximately how many years ago?

The heaviest element produced by nuclear fusion in a young star is

Planetesimals, asteriod-size objects, form during the early history of the solar nebula due to

What means the "the sun in the making"

As they formed, due to their high temperatures and comparatively weak gravitational fields, which planet were unable to retain appreciable amounts of hydrogen, helium, and ammonia?

Early earth was hot because

Earths core, mantle, and crust formed during the

Which one of the following represents the greatest expanse of geological time?

The major source of free oxygen in the atmosphere is from

The process in which plants use light energy to synthesize food sugars from carbon dioxide is called

Earths primitive atmosphere evolved from gases

The waste gas released by plants as they synthesize food sugars from carbon dioxide and water is

The great oxygen event marks the time, appx 2.5 billion years ago, when _________.

The large size of insects and amphibians during the Pennsylvanian period has been suggested to be due to _______.

The modern oceans are a major repository are the greenhouse gas ________, which some organisms utilize to make their shells

Banded iron formations are interbedded iron oxides and chert that formed on the sea floor between 3.5 and 2 billion years ago because

One important reason we do not know much about the geologic-history of the Precambrian is that

Zircons found in continental rocks give evidence that continental crust was forming as long ago as

Continental crust is formed by

Antarctica became glaciated because

Sea level rise can be caused by

Most __________ rocks are deviod of fossils, which hinders correlation of rocks

The Appalachian Mountains formed as a result of

The supercontinent of Pangea began to break up during the ___________ era

The beginning of the Phanerozoic is marked by the ________

During the early Paleozoic era, South America, Africa, Australlia, India, and perhaps China comprised the vast southern continent of _______

By the close of the Paleozoic, all the continents had fused into the single super continent of _______

At the start of the Triassic, most of the continent were above sea level, and sediments from that time are often red because _______

The North American Cordillera formed as a result of ________

The most common Precambrian fossils are ______, layered mounds of calcium carbonate

Which tyoe of bacteria thrive in enviornments that lack free oxygen?

A major obstacle the first land planets had to overcome was ________

An important evolutionary step for reptiles was _____

The first fully land-based animals were ____

The largest mass extinction in the Phanerozoic occurred in the ____

What group of animals were the first to leave the ocean to become the first amphibians?

Which era is sometimes called the "age of dinosaurs"?

Birds evolved from ____

One group of reptiles, exemplified by the fossil Archaeopteryx, led to the evolution of ____

Mammals became the dominant land animals during the ______ era.

The dominant life forms during the Cenozoic Era were _____