Nitrogen and Phosphorus Cycle

​Lesson Objective

Describe the nitrogen cycle's processes and human impacts.

Multiple Choice

What is the first step in the nitrogen cycle?

• Nitrification
• Denitrification
• Nitrogen fixation
• Ammonification

Multiple Choice

What does atmospheric nitrogen turn to in nitrogen fixation?

• nitric acid (HNO3)
• nitrate (NO3-)
• urea (CO(NH2)2)
• ammonia (NH3)

Multiple Choice

What is the 2nd step of the nitrogen cycle?

• Nitrification
• Assimilation
• Ammonification
• Denitrification

Open Ended

how is nitrate passed between organisms?

Multiple Choice

What are the chemicals transformations involved in nitrification?

• NO3-NO2-NH3

• NH4 → NO2

• NO2- N2 -NH3

• NH3 → NO2- → NO3

Open Ended

name a sink in the nitrogen cycle

Open Ended

What do you know of the phosphorous cycle

Multiple Choice

What is weathering?

• Weathering is the formation of clouds and precipitation.
• Weathering refers to the movement of rocks from one place to another.
• Weathering is the breakdown of rocks and minerals.
• Weathering is the process of creating new rocks.

Multiple Choice

Phosphorous is found in the atmosphere

• True

• False

Open Ended

Name a sink from the phosphorous cycle

Multiple Choice

What role does water and carbonic acid play in the silicon cycle?

• Water and carbonic acid prevent the weathering of silicate minerals.
• Water and carbonic acid aid in the weathering of silicate minerals, releasing silicon into the environment.
• Water and carbonic acid are used to absorb silicon from the atmosphere.
• Water and carbonic acid are primarily involved in the formation of igneous rocks.

Multiple Choice

What is metamorphic rock?

• Metamorphic rock is formed due to heat and pressure.

• Metamorphic rock is formed from volcanic activity.
• Metamorphic rock is a type of sedimentary rock.
• Metamorphic rock is created by the cooling of magma.

Open Ended

name a sink in the silicon cycle