Geologist Explains 'Hot Blob' Under US and Its Effect on Appalachian Mountains

Understanding the 'Hot Blob'

• 💡 The 'hot blob' is a region of unusually hot rock, approximately 220 miles wide, located in the Earth's mantle, about 125 miles below the surface.
• 🧠 Contrary to sensationalized reports, it is solid rock, not a gelatinous substance, and is unlikely to erupt or ooze into populated areas.
• 🔬 The blob is composed of basalt, a common material found in the Earth's mantle, and its presence is detected by its higher temperature compared to surrounding rock.

Movement and Plate Tectonics

• ⚠️ There is a scientific controversy regarding whether the blob is actively moving, with a recent study suggesting it is.
• 🌍 The study proposes that the blob is tracking along with the North American tectonic plate, which moves about one inch per year westward.
• 📌 It is unlikely that the blob will detach and move directly under New York City, as it appears to be moving in conjunction with the crust.

Impact on Appalachian Mountains

• ⛰️ The heat from the blob is believed to be pushing up on the bottom of the Earth's crust beneath the Appalachian Mountains.
• ⚡ This upward pressure is thought to be the reason why the Appalachian Mountains have not eroded significantly over time.
• 🌋 In the distant past (80-100 million years ago), similar heat sources in this region erupted volcanoes, but this is not expected to happen again soon.

Heat Origin and Earth's Core

• 🔥 The heat from the blob is part of a larger process where heat from the Earth's core tries to rise and circulate within the mantle.
• ☀️ The Earth's core reaches temperatures similar to the surface of the sun, around 10,000 degrees Fahrenheit.