Geography

What would have happened to Earth if the Sun had been significantly larger than it is?

Started by yoooooman

What would have happened if Earth were located 10% further out from the Sun?

Started by fox

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

Started by Tazate

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

Started by nautica902

Why is the mass of Earth important for life?

Started by dollx

Modern geochronology studies recognize that most radiometric dates record a time when a mineral ...

Started by jayhills49

Compare and contrast relative age dating with radiometric age dating. What is a limitation (if any) of each?

Started by tuffie

What is the name of a Phanerozoic era that means ancient life?

Started by jparksx

For a radioactive isotope like Uranium-235, what does the 235 indicate?

Started by rl

The remains or traces of prehistoric life are called ________.

Started by codyclark

In an undeformed sequence of sedimentary rocks, each bed is older than the one above and younger ...

Started by Chloeellawright

What term denotes blocks of older rock enclosed in a body of younger igneous rock?

Started by theo

All of geologic time prior to the beginning of the Paleozoic era is termed the ________ eon.

Started by Collmarie

After two half-lives, there is ________ percent of radioactive material remaining.

Started by oliviahorn72

The percentage of radioactive atoms that decay during one half-life is ________.

Started by JGIBBSON

After three half-lives, ________ of an original radioactive parent isotope remains.

Started by cherise1989

Strata above a(n) ________ were deposited after older strata were deformed.

Started by crobinson2013

A(n) ________ is an erosional unconformity with parallel beds or strata above and below.

Started by azncindy619

There is geologic evidence that Earth has experienced ________.

Started by arivle123

Examine the words and/or phrases below and determine the relationship among the majority of ...

Started by BrownTown3

In the last few years improvements in technology have allowed geologists to date single grains of ...

Started by nevelica

Different periods of the geologic time scale are different in length. Why?

Started by awywial

The era known as the "age of mammals" is the ________ era.

Started by pepyto

About 88 percent of geologic time is represented by the time span called the ________ era.

Started by ss2343

As it relates to the names of the eras in the geologic time scale, what is meant by "zoic"?

Started by kellyjaisingh