Our Planet Earth

What layers of the atmosphere come after the troposphere?

• Stratosphere, Mesosphere, Thermosphere and Exosphere
• Stratosphere, Thermosphere, Exosphere, and Mesosphere
• Exosphere, Stratosphere, Mesosphere and Thermosphere
• Thermosphere, Stratosphere, Exosphere and Mesosphere

The middle layer of the Earth is...

• Core

• Mantle

• Crust

The 4 Planetary Systems are:

• atmosphere, geosphere biosphere and hydrosphere

• atmosphere ,biosphere and oceans

• atmosphere, biosphere, stratosphere , and geosphere

Is the Earth layer that contain water

• geosphere

• biosphere

• atmosphere

• hydrosphere

What is the layer of the Earth closet to the surface

• crust

• mantle

• nucleus

The gas layer of the Earth that provides the air we breath is:

• atmosphere

• hydrosphere

• biosphere

What is the composition of the atmosphere?

• 15% oxygen and 85% nitrogen

• 23% nitrogen and 77% Helium

• 78% nitrogen and 21% oxygen

• 78% nitrogen and 21% ozone

What is the layer that contain little oxygen

• troposhere

• stratosphere

• mesosphere

• thermosphere

The 4 types of biomes are:

• taiga, tundra, deserts and tropical rainforests

• deserts ,dunes, tundra and beaches

• oceans, taiga ,tundra and deserts

What are biomes?

• Are very large water regions.

• Are very extensive ecosystems distinguished by the temperature

• Its a gas layer composed of different elements including nitrogen.