Understanding Glaciers

The video explores glaciers, their formation, and their role in Earth's history. It explains how glaciers form from layers of snow over long periods, their global distribution, and their movement. The video also discusses the impact of climate change on glaciers, highlighting their retreat and the consequences of melting, such as rising sea levels and changes in water supply. Glaciers are crucial for understanding Earth's past climate and are vital for ecosystems and human use.

What is a glacier primarily made of?

• Lava

• Sand

• Ice

• Rock

What percentage of the Earth's fresh water is stored in glaciers?

• One quarter

• One half

• All of it

• Three quarters

Which continent is home to the world's largest glacier?

• Africa

• Europe

• Antarctica

• Asia

Where are most of the world's glaciers located?

• In tropical regions

• Near the equator

• In polar regions

• In deserts

During the ice age, what fraction of the Earth's land was covered by glaciers?

• Two thirds

• One half

• One third

• One tenth

What happens when a glacier becomes very large and heavy?

• It sinks

• It explodes

• It evaporates

• It advances

What can studying glacier ice reveal about the Earth?

• Future weather patterns

• Past climate conditions

• Current ocean levels

• Animal migration routes

How have glaciers changed in the last hundred years?

• They have grown larger

• They have remained the same

• They have retreated significantly

• They have moved to new locations

What is one positive effect of glaciers melting?

• Increased sea levels

• Decreased global temperatures

• More freshwater for rivers

• Loss of habitats

What is a potential negative consequence of excessive glacier melting?

• Decreased rainfall

• Lower sea levels

• Increased snowfall

• Higher sea levels