Transcript PLATE TECTONICS SEAFLOOR SPREADING

PLATE TECTONICS
SEAFLOOR SPREADING
PREDICT THREE THINGS THAT MIGHT
BE DISCUSSED IN SECTION 2 AFTER
READING ITS HEADINGS.
1.
2.
3.
PLATE TECTONICS
SECTION 2 SEAFLOOR SPREADING
DEFINE
• SEAFLOOR
• SEAFLOOR SPREADING
• INTERVAL
PLATECTONICS
SEAFLOOR SPREADING
SEQUENCE STEPS
DESCRIBING
SEAFLOOR
SPREADING.
* I FOUND THIS
INFORMATION ON
PAGE____________.
SEAFLOOR
SPREADING
1. HOT, LESS
DENSE MATERIAL
BELOW EARTH’S
CRUST RISES
TOWARD THE
SURFACE AT A
MID- OCEAN
RIDGE
2. THE LESS
DENSE
MATERIALS
FLOWS_______
______________
______________
3. AS THE
SEAFLOOR
SPREADS
APART, MAGMA
IS___________
____________
____________
PLATE TECTONICS
SEAFLOOR SPREADING
MAKE A DIAGRAM TO IDENTIFY EVIDENCE
FOR SEAFLOOR SPREADING. USE ARROWS
TO SHOW THE DIRECTION OF SPREADING,
AND INDICATE WHERE OLDER ROCK AND
NEWER ROCK OCCUR.
* I FOUND THIS INFORMATION ON
______________.
PLATE TECTONICS
SEAFLOOR SPREADING
MODEL THE POLARITY OF EARTH’S
MAGNETIC FIELD TODAY.
• DRAW A SPHERE TO REPRESENT EARTH.
• LABEL THE NORTH POLE AND SOUTH POLE.
• DRAW ARROWS INDICATING THE DIRECTION
IN WHICH MAGNETIC LINES OF FORCE ENTER
AND LEAVE EARTH.
• I FOUND THIS INFORMATION ON
PAGE_________
PLATE TECTONICS
SEAFLOOR SPEADING
SUMMARIZE HOW REVERSALS IN THE DIRECTION OF
EARTH’S MAGNETIC FIELD HAVE PROVIDED EVIDENCE
OF SEALFLOOR SPREADING.
AT TIMES, THE _______________ THAT PASS
THROUGH EARTH HAVE _______________. __________
OF EARTH’S MAGNETIC FIELD ARE RECORDED IN
____________ THAT FORMS ALONG __________.
SCIENTISTS CAN DETECT ___________ THAT ARE
____________ TO MID-OCEAN RIDGES. THIS OCCURS
ON PAGE ____________________.
PLATE TECTONICS
SEAFLOOR SPREADING
SUMMARIZE
HOW SOUND WAVES ARE USED TO MAP THE SEAFLOOR.
* I FOUND THIS INFORMATION ON PAGE________.
MODEL
THE PROCESS OF SEAFLOOR SPREADING BY DRAWING A
CROSS SECTION OF A MID- OCEAN RIDGE AND THE
MAGMA BELOW IT. USE ARROWS TO INDICATE THE
DIRECTION OF MOTION.
* I FOUND THIS INFORMATION ON PAGE _________.