7.13_Do Now/ Classwork/Exit Ticket

Do Now: Starting at nitrogen gas (N2), put the steps of the nitrogen cycle in the proper order.

1. Precipitation puts nitrogen gas (N2) into soil
2. Nitrogen gas (N2) is converted into ammonia (NH4+) by nitrogen fixation in plant roots, or by ammonification when decomposers break down dead organic material (plants and animals).
3. Nitrogen gas (N2) in the atmosphere
4. Ammonia (NH4+) is converted to nitrate (NO3-) by bacteria doing nitrification.
5. Nitrates (NO3-) are absorbed into plants by assimilation and put into the food web. Denitrifying bacteria convert free nitrates (NO3-) in soil to nitrogen gas (N2).

Use the article to answer the classwork questions.

Classwork: Play the video. If it doesn't work, refresh the page and try again. Why are the fish opening and closing their mouths like that?

Classwork: Why are the fish dying in the Peconic River?

Classwork: What has caused the problem that you identified in the previous question?

Classwork: What is one solution that the town of Riverhead tried to fix the fish kill?

Classwork: What are three sources of nitrate in the water supply?

Exit Ticket: Describe how Eutrophication can damage ecosystems. In your response, include the following vocabulary words:

Nitrate

Algal Bloom

Dissolved Oxygen

Surface Runoff

Fertilizer

Bonus: How much seaweed does Mr. Divan harvest in an average week? Please put your answer in pounds.