Exam 13: A Biography of Earth

A crustal rock dated to 1.9 Ga is how old?

The generally accepted scientific theory for the origin of our Moon involves ________.

A shield is ________.

A platform is ________.

A greenhouse climate on Earth was associated with relatively high atmospheric levels of which gas?

Where today would you expect to find rocks deposited by late Paleozoic glaciers?

Which gas found in today's atmosphere was absent during the Hadean and Archean eons?

Which flying reptiles,first appearing during the Triassic,were the earliest flying vertebrates?

The Himalayas were produced during the Cenozoic by the collision of southern Asia with ________.

Permian,Triassic,and Jurassic forests were dominated by large ________.

Through geologic time,continents have drifted over the surface of Earth,but each continent has ________.

Earth became internally differentiated,with a metallic core distinct from the rocky mantle,during the ________.

An iridium-rich layer of clay,glass spherules,and shocked quartz grains strongly suggest that the K-T boundary extinctions were at least in part caused by ________.

Toward the end of the Archean Eon,________.

A fold-thrust belt is ________.

Earth was hotter than today during the Hadean for all of the following reasons EXCEPT ________.

The first mammals appeared during the ________ Period.

Oxygen in Earth's atmosphere is derived from ________.

The eon represented by abundant deposits of strata with shelly fossils is the ________.

Once an ancient mountain range is destroyed by erosion,what evidence can geologists look for to learn of its past existence?