Earth and its Subsystems

What are the factors that make a planet habitable?

• Temperature, water, atmosphere, energy, and nutrients

• Gravity, sunlight, air, and land

• Rocks, minerals, and gases

• Plants, animals, and humans

How old is Earth according to radiometric dating?

• 1 billion years

• 2.5 billion years

• 4.5 billion years

• 6 billion years

Which subsystem of Earth includes all the water parts on the planet?

• Hydrosphere

• Geosphere

• Biosphere

• Atmosphere

What is the main gas present in Earth's atmosphere?

• Nitrogen

• Oxygen

• Carbon Dioxide

• Argon

Which layer of the atmosphere is closest to the surface and where weather occurs?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

What is the function of the stratosphere?

• Absorbing UV radiation

• Producing weather

• Burning up meteors

• Allowing radio communication

What is the biosphere?

• All living components of the Earth

• The solid portion of the Earth

• The outermost layer of the atmosphere

• The water parts on the planet

Which layer of the Earth's geosphere is the outermost layer?

• Crust

• Mantle

• Outer Core

• Inner Core

What is the main component of the geosphere?

• Rocks

• Water

• Air

• Plants

What is the water cycle?

• The process of water freezing into ice

• The movement of water from the ocean to the atmosphere and back to the ocean

• The process of water turning into vapor

• The process of water evaporating from plants