the crust
Actually, the Troposphere Layer can be considered as Earth's first protective layer, because its well-the atmosphere's first layer. You can think of it that way to remember which is Earths first layer.
troposphere
The first layer of the Earth's atmosphere is called the troposphere, and it is in direct contact with the Earth's surface. This layer is where weather events occur and where most of the Earth's clouds and precipitation are found. Temperature usually decreases with altitude in the troposphere.
STRATOSPHERE
the layer of rock that comprises 67% of earths mass
half of earths layer
It's called lithosphere as I remember in science.
The earth thinnest layer is the crust.
The crust is the thinnest layer of the Earth.
the crust then comes the mantel the inner layer then core
The layer below the earth's outer layer is mesosphere. It is the 3rd layer.
Mantle.