Unit 5 Chapter 9: Earth's Undersea World

Chapter 9: Earth's Undersea World

Model: Partner A- Read page 82

Think: What is the Mid-Atlantic Ridge?

TURN AND TALK

Multiple Choice

The Mid-Atlantic Ridge is ________________.

• a tectonic plate

• the boundary between several tectonic plates

• a volcano

• a submersible

Partner A- Read page 83

Think: Describe the Mid-Atlantic Ridge.

TURN AND TALK

Multiple Choice

Which phrase describes the Mid-Atlantic Ridge?

• a warm, dark area on the sea floor

• a long, rugged underwater mountain range

• a cluster of seamounts

• a cluster of hydrothermal vents

Partner B- Read page 84

Think: What does this simile like the stitching on a baseball mean?

TURN AND TALK

Multiple Choice

The author uses a simile when describing the mountain chain formed by mid-ocean ridges, saying it is like the stitching on a baseball. What does this simile mean?

• The mountain chain is strong like the stitching on a baseball

• The mountain chain is red like the stitching on a baseball

• The mountain chain is continuous like the stitching on a baseball

• The mountain chain is long like the stitching on a baseball

Partner A- Read page 85 then

Partner B- Read page 86

Think: What is seafloor spreading?

TURN AND TALK

Multiple Choice

Seafloor spreading explains which of the following?

• The presence of mid-ocean ridges on the seafloor

• Wegener's theory of continental drift

• Both A and B

• Neither A and B

Partner A- Read page 87 then

Partner B- Read page 88 and 89 (next slides)

Think: Where do seafloor creatures live?

TURN AND TALK

Multiple Choice

Which animal does NOT live around hydrothermal vents?

• white crabs

• pale, blind shrimp

• giant tube worms

• sponges

Multiple Choice

__________ and __________ live around seamounts.

• Brittle stars; pale, blind shrimp

• Schools of fish; football-sized clams

• Deep-sea corals; anemones

• White crabs; giant tube worms