【People's Education Press】High School Geography: Elective Compulsory Course 1: Understanding the 'Inflow' and 'Outflow' of Terrestrial Water Bodies Through the Shrinkage of the Aral Sea

Dynamic Water Budgets of Terrestrial Water Bodies: Who Tipped the Scales of the Aral Sea?

Imagine a vast blue basin deeply embedded in Central Asia’s desert — this was once the Aral Sea. Asterrestrial water bodiesan important member of (including rivers, lakes, groundwater, etc.), the vitality of the Aral Sea depended on an invisible 'balance of inflow and outflow'.

Under natural conditions, the Aral Sea received its 'inflow (supply)' through runoff from the Amu Darya and Syr Darya rivers, with surface evaporation being its primary 'outflow (expenditure)'. When inflow equaled evaporation, the lake maintained its vast blue expanse. However, this delicate balance was completely disrupted in the 1960s.

Summary and Synthesis: In inland regions, many rivers ultimately flow into lakes. Once inflowing rivers are diverted or cease flowing, lakes dry up. The Soviet Union's 'White Gold Project' massively diverted water for cotton irrigation, reducing inflow to the Aral Sea from 50 billion cubic meters nearly to zero. This was not just the loss of water, but also triggered salt dust storms and ecological collapse, profoundly illustrating the holistic nature of geographical systems.

QUESTION 1

What was the main human-caused reason for the Aral Sea's shrinkage since the 1960s?

Climate warming increasing evaporation

Land reclamation by enclosing lakes to increase arable land

Large-scale diversion of river water for agricultural irrigation

Transboundary rivers dammed and diverted for hydroelectric power generation

QUESTION 2

When an inland lake in a dry region is in a state of water balance, it means:

Inflow volume equals evaporation volume from the lake surface

Inflow volume exceeds evaporation volume from the lake surface

The lake level continues to rise

Groundwater recharge stops

QUESTION 3

After the Aral Sea shrank, local salt dust storms became frequent. This reflects the geography's:

Diversity

Holism

Regionalism

Dynamism

QUESTION 4

In an inland region, if rivers feeding a lake cease due to human activity, the lake will ultimately:

Become less saline

Dry up

Transform into an outflowing lake

Maintain constant area

QUESTION 5

When the 'Water Balance Scale' tilts to the right (outflow), it indicates:

Increased precipitation

Reduced water storage

River flow increases

Groundwater level rises