Earth's current atmosphere is

• 78% nitrogen, 21% oxygen, 0.9% argon and 0.037% carbon dioxide
• 78% oxygen, 21%nitrogen, 0.9% argon, 0.037% carbon dioxide
• 78% nitrogen, 21% argon, 1% oxygen
• 78% oxygen, 21% nitrogen, 1% carbon dioxide

The layers of the atmosphere in order from bottom to top are

• troposphere, stratosphere, mesosphere, thermosphere, exosphere
• troposphere, mesosphere, atmosphere, thermosphere
• mesosphere, thermosphere, troposphere, stratosphere, exosphere
• thermosphere, stratosphere, mesosphere, troposphere, exosphere

The layer of the atmosphere containing the ozone layer is

• troposphere
• stratosphere
• thermosphere
• mesosphere

The layer of the atmosphere containing our weather is

• thermosphere
• stratosphere
• troposphere
• mesosphere

The layer of the atmosphere containing the ionosphere and auroras is

• troposphere
• mesosphere
• stratosphere
• thermosphere

The layer of the atmosphere where meteors burn up

• mesosphere
• thermosphere
• troposphere
• stratosphere

The layers of the atmosphere that get colder as altitude increases are

• thermosphere and troposphere
• meosphere and troposphere
• stratosphere and thermosphere
• thermosphere and mesosphere

The layers of the atmosphere that get hotter with increased altitude are the

• thermosphere and mesosphere
• troposphere and mesosphere
• thermosphere and stratosphere
• stratosphere and mesosphere

The hottest layer is the

• themosphere
• stratosphere
• mesosphere
• troposphere

The troposphere gets colder as you go up.  What is the reason for this?

• the troposphere is heated by the sun reacting with oxygen (ozone)
• the troposphere is heated by Earth's surface
• the troposphere is heated by Carbon dioxide heat release
• it is getting closer to outerspace