Which sphere is missing?

What is Biosphere?
It measures atmospheric pressure.
What is barometer?
Earth's Rocks and Soils.
What is Geosphere?
What is Biosphere?
What type of weather front is this?

What is Occluded Front?
Gravity
The layers of air that surrounds the Earth.
What is Atmosphere?
The temperature air has cooled to become completely full of vapor and start turning back to liquid.
What is a Dew Point?
Plant leaves release water into the air.
What is transpiration?
Cloud formation.
What is Condensation?
Where water can be found on Earth.
What is Hydrosphere?
A cold air mass that sinks to the ground.
What is High Pressure?
Causes a desert to form on the leeward side of a mountain.
What is Rain Shadow Effect?