1 / 10

Cycling of Materials

Cycling of Materials. Chapter 5 Section 2. Carbon Cycle. Carbon cycles between the atmosphere, land, water and organisms Short term part of cycle – producers, consumers and atmosphere Mostly by photosynthesis and respiration Long term part of cycle – carbonates, limestone, and fossil fuels

hollie
Download Presentation

Cycling of Materials

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cycling of Materials Chapter 5 Section 2

  2. Carbon Cycle • Carbon cycles between the atmosphere, land, water and organisms • Short term part of cycle – producers, consumers and atmosphere • Mostly by photosynthesis and respiration • Long term part of cycle – carbonates, limestone, and fossil fuels • Formed underground over thousands of years • Human impact– increased carbon (CO2) in the atmosphere • Leads to global warming

  3. Nitrogen Cycle • Nitrogen - used by all organisms to build proteins • 78% of the atmosphere is N2 • Organisms can’t use nitrogen in this form • Nitrogen-fixing bacteria “fix” the nitrogen, converting it to forms that plants can use • Nitrogen fixing bacteria = NFB

  4. NFB live in nodules on the roots of legumes • beans, peas, clover • Plants take in ‘N’ through their roots • Animals eat plants • Both plants and animals die • Decomposers break down wastes and return ‘N’ to soil • Nitrogen in soil can be returned as N2 to atmosphere by another type of bacteria

  5. Phosphorus Cycle • Phosphorus cycles mainly between rocks and organisms in the environment • Very slow cycle • No atmospheric component because phosphorus is rarely a gas • Large amounts of P sink to bottom of ocean and build up in sediment • Becomes part of sedimentary rock

  6. Human Impact • Fertilizer has high amounts of ‘N’ and ‘P’ • Used to increase plant growth • Excess fertilizer usage leads to increased ‘N’ and ‘P’ in runoff • In an aquatic ecosystem, causes algae bloom which leads to lack of oxygen in the water • Kills fish that need oxygen to breathe

  7. Human Impact (cont.) • ‘N’ in form of Nitric Oxide is released from burning wood, coal, & oil • Nitric Oxide is harmful gas, which combines with oxygen and water vapor • Forms Nitric Acid, which dissolves in rain and snow • Result – Acid Precipitation: rain, snow, sleet, fog • Kills organisms, changes pH of ecosystem

More Related