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Writing Hand

Unit 4 -Water & Aquatic Food Production Systems & Societies

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Globe Showing Europe Africa

Unit 1 - Foundations Of Environmental Systems & Societies

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Herb

Unit 2 - Ecosystems & Ecology

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Flexed Biceps

Unit 3 - Biodiversity & Conservation

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Deciduous Tree

Unit 5 - Soil Systems & Terrestrial Food Production Systems & Societies

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Cloud

Unit 6 - Atmospheric Systems & Societies

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Thermometer

Unit 7 - Climate Change & Energy Production

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Briefcase

Unit 8 - Human Systems & Resource Use

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Bar-Chart

Internal Assessment

<ul>
	<li>Think of it as &quot;overfeeding&quot; a water body with nutrients.</li>
	<li>Main culprits: nitrogen and phosphorus. 🌱</li>
	<li>When there&#39;s too much nutrient, algae grow excessively.</li>
	<li>Decomposition of these algae ➡️ even more nutrients in the system! 🔄</li>
</ul>

<ul>
	<li>Positive Feedback: Like an excited dog chasing its tail!
	<ul>
		<li>More nutrients ➡️ more algae.</li>
		<li>More algae die ➡️ even more nutrients.</li>
		<li>The cycle keeps going and getting stronger!</li>
	</ul>
	</li>
	<li>Negative Feedback: Nature&#39;s way of balancing things out. 🔄
	<ul>
		<li>More dead organic matter (like the dead algae) = Yummy food for decomposers. 🍽️</li>
		<li>Decomposers feast on it ➡️ number of decomposers increases.</li>
		<li>More decomposition ➡️ less dead stuff around.</li>
	</ul>
	</li>
</ul>

🌍 Real-world example: Just like eating too much candy gives you a sugar rush (positive feedback), but eventually, you feel tired and crash (negative feedback).

<ul>
	<li>Tweak Human Activities: Sometimes, the answer is in changing our habits.
	<ul>
		<li>Opt for alternative fertilizers and detergents. 🌱</li>
	</ul>
	</li>
	<li>Be the Water&#39;s Guardian: Protect our water bodies at the source.
	<ul>
		<li>Update sewage treatment plants to get rid of nitrates and phosphates. 🏭</li>
	</ul>
	</li>
	<li>Bring Back Healthy Waters: When things go south, take active measures.
	<ul>
		<li>Clean the water by removing mud from eutrophic lakes. 🌊</li>
	</ul>
	</li>
</ul>

<ul>
	<li>Timing is Key: No nitrogen fertilizers in wet seasons. Why? Wet soil = more wash away. ⏳</li>
	<li>Smart Planting: Use autumn-sown crops, which:
	<ul>
		<li>Have roots that save nitrogen. 🌱</li>
		<li>Can use the nitrogen from the previous year.</li>
		<li>Should be planted early and kept through winter for max nitrogen conservation.</li>
	</ul>
	</li>
	<li>Stay Aware of the Environment:
	<ul>
		<li>No nitrogen near streams or lakes. 🚫</li>
		<li>Check the weather: No nitrogen application if heavy rain&#39;s coming.</li>
		<li>Used less nitrogen? Remember that if last year was dry!</li>
	</ul>
	</li>
	<li>Land Management:
	<ul>
		<li>Say no to ploughing grass &ndash; it releases nitrogen.</li>
	</ul>
	</li>
	<li>Water Treatment Tips:
	<ul>
		<li>​​​​​​​Algae removal from eutrophic water 🌱➡️🗑️.</li>
		<li>Mud eviction from streams and ponds.</li>
		<li>Oxygen parties: Pump oxygen into the water!</li>
		<li>And here&rsquo;s a fun one: Barley straw bales 🌾! As they decay, they snack on nitrogen and trap phosphorus.</li>
	</ul>
	</li>
</ul>

💭 Fun Fact! Using barley straw can reduce nitrogen loss by up to 13%. Imagine straws acting as tiny vacuum cleaners for nutrients!

Win Against Water Pollution!

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Standard Level

Environmental Systems & Societies SL

Unit 4 -Water & Aquatic Food Production Systems & Societies

Win Against Water Pollution!

Table of content

Eutrophication in a nutshell 🥜

Feedback loops in eutrophication 💡

Unlock the Full Content!

Unit 4 -Water & Aquatic Food Production Systems & Societies

Win Against Water Pollution!

Table of content

Eutrophication in a nutshell 🥜

Feedback loops in eutrophication 💡

Unlock the Full Content!