The atmosphere and hydrosphere

The main content of the primitive atmosphere was

• Nitrogen

• Carbon dioxide

• Chlorine

• Water vapour

We can find liquid water due to greenhouse effect.

• True

• False

What does this image represent?

• Carbon dioxide

• Methane

• Water

• Mario Sanchez

A property of water is

• cause flooding

• freshen up the atmosphere

• freezing the poles

• act as a universal solvent

The main component of the atmosphere today is

• 78% Oxygen

• 21% Nitrogen

• 78% Nitrogen

• 21% Oxygen

When measuring pressure, one atmosphere coincides with one pascal

• True

• False

Answer explanation

1 atmosphere is 101,325 pascal

The increase of oxygen in the atmosphere occurred because of

• hydrothermal springs

• photosynthetic organisms

• limestone

• dinosaurs

Answer explanation

Photosynthetic organisms such as cyanobacteria caused an increase in oxygen concentration in the early atmosphere.

What phenomenon occurs in the thermosphere?

• 
• 
• 
• 

The mesosphere protects us from ultraviolet rays by being above the stratosphere.

• True

• False

Answer explanation

The stratosphere is the layer that protec us from ultraviolet rays.

Radio waves are propagated to our homes thanks to the ionisation of gases in the ionosphere.

• True

• False