Geochemical Cycles and Their Processes

The video tutorial covers the geochemical cycles, focusing on the water, carbon, and nitrogen cycles. It explains the movement of matter through ecosystems, highlighting the importance of these cycles for life. The water cycle is driven by the sun and involves processes like evaporation and precipitation. The carbon cycle includes photosynthesis and combustion, while the nitrogen cycle relies heavily on bacteria for processes like nitrogen fixation. Human impacts, such as deforestation and pollution, are discussed in relation to each cycle.

What are geochemical cycles also known as?

• Carbon cycles

• Nutrient cycles

• Energy cycles

• Water cycles

Which of the following is NOT a main step in the water cycle?

• Precipitation

• Photosynthesis

• Transpiration

• Evaporation

What is the primary driver of the water cycle?

• Wind

• Sun

• Moon

• Earth's rotation

In the carbon cycle, what process involves plants capturing CO2 to make sugar?

• Decomposition

• Photosynthesis

• Respiration

• Combustion

Which of the following is a product of combustion?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What role do decomposers play in the carbon cycle?

• Break down dead materials and return carbon to the soil

• Capture CO2 from the atmosphere

• Release oxygen into the atmosphere

• Convert nitrogen into usable forms

What is the main form of nitrogen in the atmosphere?

• N2

• NO3

• NH3

• NO2

Which process in the nitrogen cycle involves bacteria converting nitrogen from waste into ammonia?

• Nitrogen fixation

• Ammonification

• Denitrification

• Nitrification

What is a major negative impact of human activity on the nitrogen cycle?

• Deforestation

• Water pollution

• Combustion

• Fertilizer use

How does deforestation affect the water cycle?

• Decreases transpiration

• Increases infiltration

• Increases transpiration

• Decreases runoff