Exam 19: Earths Evolution Through Geologic Time

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

Primitive organisms, called_________ , reproduce asexually and contain cells that lack organized nuclei.

Following the mass extinction at the end of the Mesozoic Era, two groups of mammals, the_________and placentals, further evolved and diversified.

Most of Earth's iron ore occurs in middle_________ rocks.

The late_________ Era extinction was the greatest of at least five mass extinctions to occur over the past 600 million years.

The most common Precambrian fossils are_________ , layered mounds of calcium carbonate.

The most economically important resource in Cenozoic strata of the Gulf Coast is __________ .

Briefly discuss the origin of Earth's atmosphere and oceans. Are the two related to one another? Also, has the atmosphere remained constant over time or has it changed? And if so then how has it changed?

Most _________rocks are devoid of fossils, which hinders correlation of rocks.

Abundant fossil evidence did not appear in the geologic record until about_________ .

The supercontinent of Pangaea began to break up during the_________ Era.

The time of the great extinction that took place at the end of the Mesozoic Era is called the_________or KT boundary.

Which period is known as the "age of fishes"?

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

The "ancient age" time period is the _________Eon.

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

The cells of these primitive organisms lack organized nuclei and they reproduce asexually.

The_________ means "the sun in the making."

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

The_________ period is sometimes called the "golden age of trilobites."