Read the three excerpted passages below. Match each passage with the title that most accurately and comprehensively captures its central theme.
- Subglacial lakes remain liquid miles beneath polar ice sheets due to a combination of geothermal heat rising from the Earth's crust and immense overburden pressure that lowers the melting point of ice. Isolated from the atmosphere for millions of years, these dark reservoirs provide unique environments where extremophile microorganisms thrive, offering researchers valuable analogues for potential life in the subsurface oceans of icy moons.Subglacial Lakes: Hidden Environments Beneath Polar Ice
- Primary radar detects aircraft by transmitting high-frequency radio pulses and calculating the time reflected echoes take to return, establishing distance and bearing. However, secondary surveillance radar improves operational safety by interrogating an onboard transponder, which automatically replies with coded data detailing the aircraft's exact altitude, flight identity, and emergency status to air traffic controllers.Principles and Functions of Aviation Radar Systems
- Early steam locomotives required frequent replenishment of water and fuel along their routes, severely restricting continuous long-distance travel. The development of high-pressure multi-tubular boilers and specialized tender cars in the mid-nineteenth century dramatically increased thermal efficiency and carrying capacity, transforming railroads into reliable engines of overland continental commerce.Overcoming Range Limitations in Early Steam Locomotives
Answer
Match the passage discussing subglacial water and extremophiles with 'Subglacial Lakes: Hidden Environments Beneath Polar Ice'; match the passage explaining primary pulses and secondary transponder responses with 'Principles and Functions of Aviation Radar Systems'; and match the passage detailing boiler innovations and fuel constraints with 'Overcoming Range Limitations in Early Steam Locomotives'.
Each correct pairing links the specific scope and main idea of the passage to the title that encapsulates both its central topic and key supporting points without being overly narrow or broad.
Step-by-Step Solution
Key Concept
Selecting the Best Title
Estimated Time:1m 30s