NATURAL BRIDGE in Monument Valley spans a huge hole bored by sand-bearing winds into a water-weakened sandstone butte. Beneath it, Navajo herders tend their sheep.

2
The Creation of Deserts

MEASURED against the awesome depths of geologic time, so much more easily reckoned than comprehended, the deserts of today are relatively recent formations on the face of the earth. Just how new they are is a matter of active scientific dispute. Until a few decades ago the textbooks called the deserts "earth-old," meaning that they dated from creation. Meanwhile science was outdating the textbooks and creation was being rudely pushed back. The earth is now estimated to be on the order of five billion years old. It has been supporting life for a third to half that time, and it has had deserts at least since the Permian period, which ended 230 million years ago, although no such ancient desert exists today.

Geologists, looking at the record of the rocks, have found in some contemporary desert regions signs of aridity going back 63 million years, to the beginning of Tertiary times. But paleobotanists, looking at the fossils embedded in the sedimentary rocks, say most of these deserts can be no older than the late Cenozoic, or one to five million years old. They argue that virtually all desert-adapted plant and animal species have evolved

-27-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items

Items saved from this book

This book has been saved
Highlights (0)
Some of your highlights are legacy items.

Highlights saved before July 30, 2012 will not be displayed on their respective source pages.

You can easily re-create the highlights by opening the book page or article, selecting the text, and clicking “Highlight.”

Citations (0)
Some of your citations are legacy items.

Any citation created before July 30, 2012 will labeled as a “Cited page.” New citations will be saved as cited passages, pages or articles.

We also added the ability to view new citations from your projects or the book or article where you created them.

Notes (0)
Bookmarks (0)

You have no saved items from this book

Project items include:
  • Saved book/article
  • Highlights
  • Quotes/citations
  • Notes
  • Bookmarks
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited page

Bookmark this page
The Desert
Table of contents

Table of contents

  • Title Page 3
  • About the Author 4
  • Contents 5
  • Introduction 7
  • 1 - Scorched Belts on the Earth 9
  • 2 - The Creation of Deserts 27
  • 3 - Plants Under the Sun 52
  • 4 - The World of Desert Animals 69
  • 5 - Water: The Eternal Problem 94
  • 6 - Life Patterns in Arid Lands 112
  • 7 - Man Against Desert 127
  • 8 - The Desert Tamed 165
  • Bibliography 186
  • Credits 187
  • Index 188
Settings

Settings

Typeface
Text size Smaller Larger Reset View mode
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Help
Full screen
/ 192

matching results for page

    Questia reader help

    How to highlight and cite specific passages

    1. Click or tap the first word you want to select.
    2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
    3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

    OK, got it!

    Cited passage

    Style
    Citations are available only to our active members.
    Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

    1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

    Cited passage

    Thanks for trying Questia!

    Please continue trying out our research tools, but please note, full functionality is available only to our active members.

    Your work will be lost once you leave this Web page.

    Buy instant access to save your work.

    Already a member? Log in now.

    Author Advanced search

    Oops!

    An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.