week 5 cycles: nitrogen , water, carbon, phosphorus

Nitrogen is essential to life because

• It is needed for building the proteins needed for cells.
• It is the molecule around which all the molecules of life are built.
• It is the most common element.

Where does some water from the water cycle collect underground?

• Aqueducts
• Aquatic parks
• Aquifers
• Aquariums

Precipitation that didn’t get absorbed into the soil and made its way downhill along a surface of land is called

• Landslide
• Flood
• Runoff
• Ice-cap

Plants get nitrogen from

• .Breathing it in through their leaves from the atmosphere
• Absorbing it through roots from the ground
• Cellular Respiration

What term describes the temperature at which a substance can change state from a solid to a liquid?

• Melting point
• Boiling point
• Freezing point
• Specific heat

Based on the diagram above, which process most directly results in the storage of carbon as coal and oil over millions of years?

• Photosynthesis
• Cellular respiration
• Decomposition
• Burning fossil fuels

Nitrogen-fixing bacteria are important because

• They turn nitrogen from the air into nitrogen compounds in the soil
• They break up dead plants and animals in the soil.
• They release nitrogen from the soil into the atmosphere.

Which is an example of condensation?

• Three inches of rain fall in one hour.
• A layer of water appears on the outside of a cup of ice water
• A foot of snow falls in midwinter.
• On a hot day, water on the sidewalk quickly disappears

Which statement about decomposition is most correct?

• .Bacteria and fungi carry out the photosynthesis needed for breaking down proteins
• Bacteria put oxygen back into the atmosphere.
• Bacteria break down organic matter to nitrates that plants can use.

Based on the diagram above, which of the following major storage reservoirs of carbon, stored in the form of carbon dioxide, is not represented in this diagram?

• Algae
• Soil bacteria
• The Moon
• The ocean