Ocean Wave Reverberation
Outer Space

Why Does the Earth Hum?

Seismometers always record periodic noise. Once mysterious in nature, we attribute Earth hum to ocean waves crashing into continents, vibrating like a bell. […]

isostatic rebound

What is Isostatic Rebound?

During the last ice age, ice pushed down on continents with immense pressure. After the ice melted, land began slowly lifting which is isostatic rebound. […]


What Is the Stratosphere?

Main highlights of the stratosphere are: (1) The ozone layer absorbs harmful UV light (2) This causes temperature to rise (3) It contains 10% of air mass. […]