Final answer:
The presence of limestone at the top of Mount Everest suggests that it was once underwater. This indicates that the topography of the area has changed over time due to geological processes such as tectonic uplift and erosion.
Step-by-step explanation:
The fact that the top of Mount Everest is made of limestone suggests that it was once underwater. Limestone is a sedimentary rock formed from the accumulation of marine organisms such as shells and coral reefs. The presence of limestone at the summit indicates that the area was once covered by a shallow sea where these organisms lived and their remains accumulated over time to form limestone deposits.
This information provides evidence of the changing topography of the area, suggesting that it has undergone significant geological processes such as tectonic uplift and erosion. Over millions of years, the area was uplifted from beneath the sea, exposing the limestone layers that were originally formed underwater.
The primary topic of the question is the topography of the area and how it has changed over time due to geological processes. The SEO keywords for this answer are Mount Everest, limestone, topography, changing over time, underwater, tectonic uplift, erosion.