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
troposphere
the earth first atmosphere is troposphere
The Troposphere is the first layer above the surfacethat contains half of earths atmosphere , and it's where weather occurs.
Troposphere
The Troposphere is a layer of the first layer of the atmosphere. It is about right above the clouds.
That depends on what you mean by the "first" layer. The lowest layer (the first off the ground) is the Troposphere. The highest layer (the first coming in from space) is the Exosphere.
the answer is thermosphere, mesosphere, stratosphere, and the troposphere
the troposphere
Well,it is the first "sphere" in earth's atmosphere. Also where we see weather. Planes do fly in the troposphere. ( the air we breathe, it's in the troposphere )
Troposphere, Mesosphere, Stratosphere, and Thermosphere. Thermosphere has two levels in itself; exosphere, and ionosphere
The troposphere, I do believe.