Why is Seawater Blue

Why is Seawater Blue

Assessment

Interactive Video

Geography, Science

KG - 12th Grade

Hard

Created by

Quizizz Content

FREE Resource

The video explores why the sea appears in different colors, focusing on the role of sunlight reflection and absorption. It explains how factors like depth, salinity, and organic matter affect sea color. The Black Sea's unique color is due to bacteria, while the Red Sea's color results from algal blooms, often linked to pollution. The video concludes with a recap and a fun word-finding activity.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What causes the ocean to appear blue to our eyes?

The ocean reflects red light back to our eyes.

The ocean is naturally blue.

The ocean reflects blue light back to our eyes.

The ocean absorbs all colors of light.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What factors can affect the color of seawater?

The time of day

The type of fish in the water

The depth of the water and the amount of plankton

The temperature of the water

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of phytoplankton in the color of seawater?

They make the water appear black.

They increase the salinity of the water.

They absorb red and blue light, reflecting green.

They make the water appear red.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does the Pacific Ocean appear lighter in color compared to the Atlantic Ocean at the Drake Passage?

The Pacific Ocean has more fish.

The Pacific Ocean is deeper.

The Pacific Ocean has higher salinity.

The Pacific Ocean has lower salinity and more rainfall.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does the salinity of seawater affect its color?

Salinity has no effect on water color.

Higher salinity makes the water appear darker.

Lower salinity makes the water appear darker.

Higher salinity makes the water appear lighter.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary reason for the different colors of the Pacific and Atlantic Oceans at the Drake Passage?

Different salinity levels

Different depths

Different temperatures

Different types of fish

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What makes the Black Sea appear dark?

The presence of ink in the water

The high density of the surface water

The reflection of the night sky

The presence of bacteria that produce dark substances

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