Lake Baikal: The World's Deepest and Oldest Lake

Lake Baikal, the world's deepest and oldest lake, is a geological marvel with unique biodiversity. Formed as a rift valley, it continues to evolve with frequent tremors. Its ancient sediments offer insights into Earth's history. The lake hosts unique species, supported by hydrothermal vents and high oxygen levels. The nerpa seals, exclusive to Baikal, face threats from climate change and pollution. The lake's future depends on conservation efforts.

What mythical creature is said to inhabit Lake Baikal according to local legends?

• A giant fishy dragon monster

• A mermaid

• A sea serpent

• A kraken

What type of geological structure is Lake Baikal?

• A glacial lake

• A sinkhole

• A rift valley

• A volcanic crater

How old is Lake Baikal estimated to be?

• 25 million years

• 1 million years

• 10,000 years

• 50 million years

What unique feature does Lake Baikal have that supports its diverse life forms?

• Saltwater currents

• Underwater caves

• Hydrothermal vents

• Coral reefs

What is the primary reason for the high levels of dissolved oxygen in Lake Baikal?

• Wind mixing

• River inflow

• Convection currents

• Photosynthesis by algae

What is the only exclusively freshwater seal species found in Lake Baikal?

• Leopard seal

• Ringed seal

• Harp seal

• Baikal seal (nerpa)

What are the main threats to Lake Baikal's ecosystem?

• Overfishing and deforestation

• Pollution and climate change

• Invasive species and tourism

• Damming and agriculture

How much has Lake Baikal warmed in the past 70 years?

• 1.2°C

• 2.0°C

• 0.5°C

• 3.5°C

What could happen if Lake Baikal's water warms too much?

• Increase in fish population

• Formation of new islands

• Depletion of oxygen

• Decrease in water level

What is the potential impact of earlier ice melts on the nerpa seals?

• Migration to other lakes

• Increased breeding success

• Loss of habitat for mating

• More food availability