Why is Seawater Blue?

The video explores the reasons behind the different colors of the sea, focusing on the role of light reflection and absorption. It explains why the sea appears blue, the factors affecting sea color, and the phenomena of the Black Sea and red tide. The video concludes with a fun activity to reinforce learning.

What is the primary reason the sea appears blue to our eyes?

• Blue light is absorbed by the water.

• Blue light is reflected back to our eyes.

• The water itself is blue.

• The sky reflects on the water.

Which colors of light does water absorb more readily?

• Green and cyan

• Red, orange, yellow, and green

• Blue and purple

• All colors equally

What causes the sea to appear green near the coast?

• Presence of green algae

• Reflection of coastal vegetation

• Tiny green phytoplankton

• Pollution in the water

What role do plankton play in the ocean?

• They produce oxygen and affect water color

• They are a major source of pollution

• They increase water salinity

• They reflect sunlight back into space

What is the Drake Passage known for?

• A place with high salinity

• A region with abundant marine life

• Meeting point of the Pacific and Atlantic Oceans

• A popular tourist destination

How does salinity affect the color of the ocean?

• Higher salinity makes the water appear darker

• Higher salinity makes the water appear lighter

• Lower salinity makes the water appear darker

• Salinity has no effect on water color

Why is the Black Sea named so?

• Due to its high pollution levels

• It is surrounded by black rocks

• Because of the dense water beneath the surface

• The water is naturally black

What causes the Red Tide phenomenon?

• Pollution from industrial waste

• Presence of red algae

• Excessive nutrients in seawater

• Natural color of the water

What is a major consequence of Red Tide?

• Increase in marine biodiversity

• Improved water quality

• Suffocation of marine life

• Enhanced oxygen levels

What is the primary cause of pollution in the Red Sea?

• Tourism activities

• Industrial wastewater and domestic sewage

• Natural disasters

• Overfishing