Great Divide Basin (Endorheic) Quiz
Explore the closed drainage concept with a focus on Wyoming’s Great Divide Basin, examining its unique geography, including various lakes and playas (10 questions).
Great Divide Basin (Endorheic) Quiz: Quick Study Notes
The Great Divide Basin in Wyoming offers a fascinating look into the world of endorheic basins. Unlike most watersheds that drain to the ocean, this unique area keeps its water within, creating distinct geographical features and ecosystems. This quiz and study guide will help you understand closed drainage systems, the specifics of the Great Divide Basin, and its characteristic lakes and playas.
Key Concepts
Endorheic basins are landlocked drainage systems where water flows inward towards a central depression, evaporating or seeping into the ground instead of outflowing to the sea.
The Great Divide Basin in Wyoming is a prime example, remarkable for being an endorheic region that also straddles the North American Continental Divide.
Characteristic features include temporary, shallow lakes known as playas, which form during wet seasons and dry out completely, leaving behind salt flats.
The basin’s arid to semi-arid climate supports specialized flora and fauna, such as sagebrush and pronghorn, adapted to its harsh, dry conditions.
Key Takeaways
- Endorheic basins are closed drainage systems that do not drain to the ocean.
- Water in endorheic basins is lost primarily through evaporation or infiltration.
- The Great Divide Basin is a significant endorheic region located in south-central Wyoming.
- It holds the distinction of straddling the North American Continental Divide, meaning water on either side of this “pseudo-divide” remains trapped within the basin itself.
- Playas are common geographical features, referring to flat-bottomed depressions that become temporary lakes.
- The basin’s climate is predominantly arid to semi-arid, supporting a unique desert steppe ecosystem.
- Important economic activities in the area include mining for coal and trona.
Frequently Asked Questions
What is an endorheic basin?
An endorheic basin is a closed drainage basin that retains water internally, meaning its water outflow does not reach an ocean or external river system. Instead, water loss occurs primarily through evaporation or seepage into the ground.
Where is the Great Divide Basin located?
The Great Divide Basin is located in south-central Wyoming, United States. It is a geographically unique region that encompasses portions of several counties within the state.
What is a “playa” in geography?
A playa is a dry, flat lakebed in an arid or semi-arid region. It is typically a basin that occasionally fills with water, creating a temporary, shallow lake, which then evaporates to leave a flat, often saline, surface.
Why is the Great Divide Basin significant geographically?
It’s significant because it’s one of the few places in the world where a major continental divide (the Continental Divide of the Americas) passes through an endorheic basin. This means that waters originating in the basin, whether they flow east or west, remain trapped within the basin itself.
How does an endorheic basin lose water?
Water in an endorheic basin is primarily lost through two processes: evaporation from the surface of lakes and wetlands, and infiltration into the groundwater system. Without an outlet to a larger body of water, these are the main ways the water cycle completes within the basin.
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