### EARTH STATISTICS: Straight-Up Stats of Earth

This list of Earth statistics provides all the numbers of our home planet. For example, here are size, rotation, density, temperature, orbit, age and more. […]

### CHANDLER WOBBLE: Why the Earth Wobbles Like a Toy Top

Earth spins on its axis of rotation. But it doesn’t spin perfectly. Like a toy top, it wobbles when it spins. This displacement is the Chandler Wobble. […]

### ESCAPE VELOCITY: Earth’s Nearly Closed System

The escape velocity of Earth (11.186 km/s) is the speed at which a free object must travel to escape into space from the planet’s gravitational pull. […]

### EARTH SHAPE: The Oblate Spheroid and Equator Bulge

Earth is not a perfect sphere. In fact, it’s in the shape of an oblate spheroid. Earth shape bulges at the equator and flattens at the north and south pole. […]

### EARTH TILT: Effects of 23.5 Degrees Axis Inclination

Imagine sticking a pencil into the Earth’s poles and twisting your wrist 23.5°. This is the Earth tilt essential in seasonal patterns, climate and life on Earth. […]

### HOW GRAVITY WORKS: The Sculptor of Solar Systems

What brings order on Earth is gravity. For all matter, it’s always at work. This is how gravity works for ocean tides, planet formation and escape velocity. […]

### GEOPHYSICIST CAREER: Gravity, Magnetics and Seismic Activity

Geophysicists study the physical processes that relate to Earth. For example, they work in seismic, marine and gravity for subsurface investigations. […]

### GEOTECHNICAL ENGINEER CAREER: How To Carve a Career Path

Geotechnical Engineers understand the behavior of earth materials. For example, they interpret rock and soil samples to investigate subsurface conditions. […]

### SEASONAL PATTERNS: What Causes the 4 Seasons?

Because the Earth is tilted on its axis, it’s why we have seasons. When Earth receives more sunlight on one side, it’s summer. And vice versa for winter. […]

### Earth’s Atmosphere Composition: Nitrogen, Oxygen, Argon and CO2

From largest to smallest, Earth’s atmosphere composition contains nitrogen, oxygen, argon, CO2 and trace gases. Water vapor is excluded from this total. […]

### Inside Earth: Earth’s Crust, Mantle and Core

All planets have layers. Inside Earth, we have a crust, core and mantle. Imagine a team of drillers who set out to drill a hole to the other side of Earth. […]

### Atmosphere Layers: Troposphere, Stratosphere, Mesosphere and Thermosphere

There are 4 primary layers of the atmosphere on Earth: troposphere, stratosphere, mesosphere and thermosphere. The ionosphere and exosphere are above those. […]

### Earth’s Rotation: The Day-Night Boundary

As the Earth spins, the sun always shines on one side which gives it sunlight. When you’re facing the sun, it’s daytime. But when you’re not, it’s night. […]