If you are unfamiliar with a topic, it is often best to start with an encyclopedia, reference book or review article to gain a basic understaning of your topic as well as terminology used in the field.
Current Reviews from Annual Reveiw of Earth & Planetary Sciences
Note: the first several in the list may be prepublication notices--if you view the RSS feed or view the website, you will be able to see the full text of those already published.
Online Encyclopedias, Dictionaries, Handbooks, etc.
These books are not online, but they should be on the shelves. Come on in!
[Note: The link connects to the full record in EUREKA]