edHelper.com
Earth Science
Moving Plates



Moving Plates
Reading Level
     edHelper's suggested reading level:   grades 9 to 10
     Flesch-Kincaid grade level:   8.99

Vocabulary
     challenging words:    convecting, deformable, nonsubducting, silica-rich, sea-floor, subducts, radioactivity, subducting, rift, magnesium, fracture, slab, lithosphere, oceanic, divergent, collide
     content words:    Pacific Ocean, Pacific Ring


Print Moving Plates
     Print Moving Plates  (font options, pick words for additional puzzles, and more)


Quickly Print
     Quickly print reading comprehension


Proofreading Activity
     Print a proofreading activity


Feedback on Moving Plates
     Leave your feedback on Moving Plates  (use this link if you found an error in the story)



Moving Plates
By Trista L. Pollard
  

1     Once Wegener and other scientists began studying the movement of our continents, more hypotheses and theories were developed. During the 1960's scientists developed the theory of plate tectonics. This theory explains the reason continents move and change our planet's crust.
 
2     The lithosphere, formed by the Earth's crust and the upper part of the mantle, provides the thin outer shell for our planet. It is sectioned into tectonic plates. These plates move along the asthenosphere which is a deformable layer of the mantle. Scientists believe the asthenosphere is "plastic" rocks located just below the lithosphere. This solid rock is under an extreme amount of pressure and flows very slowly. In other words, the asthenosphere provides the lubrication the tectonic plates need to move.
 
3     Scientists have also divided our crust into the oceanic crust and continental crust. The dense oceanic crust is formed by rocks that contain iron and magnesium. The continental crust, however, is low in density and contains silica-rich rock. Our planet's tectonic plates can include both types of crust or each type alone. According to the theory, the continents and oceans are moved by these tectonic plates.
 
4     There are fifteen major tectonic plates that have been identified by scientists. Some plates are easy to identify because they are bordered by mountain ranges or deep ocean trenches. Others are hard to identify because they may be located within continents away from major surface features. Scientists have used earthquakes and volcanoes to identify plate boundaries. Earthquakes occur when there are sudden shifts along plate boundaries as the plates are moving. Scientists have found that frequent earthquakes in one area occur where two or more plates may meet. When moving plates generate magma that may erupt on the surface, volcanoes may form. Lying in the Pacific Ocean is the Pacific Ring of Fire, an area of active volcanoes. This ring of volcanoes encircles the Pacific Ocean and is one of our major earthquake zones. Based on this evidence, scientists have determined that the Pacific Ocean is surrounded by plate boundaries.

Paragraphs 5 to 11:
For the complete story with questions: click here for printable



Weekly Reading Books

          Create Weekly Reading Books

Prepare for an entire week at once!


Earth Science
             Earth Science


More Lessons
             High School Reading Comprehensions and High School Reading Lessons


More Activities, Lesson Plans, and Worksheets


Back to School
Graphic Organizers
Alphabet Worksheets
Sight Words
Math Worksheets
Mazes
50 States

Monthly Themes
January
February
March
April
May
June
July
August
September
October
November
December

Fractions
Place Value
Time and Calendar
Money
Earth Day
Solar System
Analogies
Nouns
Following Directions
Listening
Capitalization
Cursive Writing
Patterns and Sequencing
Dinosaurs
All About Me

Kindergarten
First Grade
Second Grade
Third Grade
Fourth Grade
Fifth Grade
Sixth Grade

Multiplication
Division
Main Idea
Cause and Effect
Measurement
Decimals
Rounding
Order of Operations
Verbs
Community Helpers
Adjectives
Plants
Grammar
Addition and Subtraction
Contractions
Bulletin Board Ideas
Word Searches
Crossword Puzzles
Printable Puzzles

Reading Comprehension
Reading Skills
English Language Arts





Copyright © 2011 edHelper