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Tutor profile: Tinamarie H.

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Tinamarie H.
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Questions

Subject: Environmental Science

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Question:

Compare and contrast positive and negative feedback loops.

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Tinamarie H.
Answer:

Positive feedback loops represent the increase of effects within a reaction series. Positive feedbacks are uncommon in natural systems. For example, with continued sea ice loss, there is increased warming in the arctic ocean which leads to the increased loss of sea ice. Negative feedback loops represent the decrease or stability of effects within a reaction series, typically approaching an equilibrium. Negative feedbacks are common in natural systems. For example, increased atmospheric warming leads to an increase in clouds which leads to a decrease in temperature.

Subject: Study Skills

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Question:

What can you do when studying your notes just isn't enough?

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Tinamarie H.
Answer:

Think outside the box! The biggest studying inhibitor is limiting yourself to one way of studying and thinking that it is the only way. Studying isn't about anyone but you and you have to find and do what works best for you. Here are a few examples of different ways you can study your material. Rewrite your notes: go back through your notes and write them again, neater, and with more detail. Draw it out: pictures can be easier to understand and can help you visualize. Watch a video: hearing and seeing another explanation might be exactly what you need for it to click. Flashcards: flashcards are easy to make and super portable. You can study them in between classes, in the car, or even in line for your favorite rollercoaster! Google it: make sure you are using reputable resources, but again a different explanation could cater to your specific understanding. Study in groups: group study sessions are not only helpful but usually a bit more fun than studying on your own. This can lead to less procrastination and more motivation when working together. Take turns answering and explaining questions and maybe even make a study game! Teach it: the best way to make sure you know something is to teach it. If you can teach it, then you know it. Try teaching a friend, parent or sibling the subject you're studying. Ask for help: don't be afraid to let someone know you're confused, teachers want you to succeed and most appreciate the extra effort and are happy to explain concepts, even if they aren't your specific teacher. Make sure to check out tutoring services offered as well. A few other tips: make a focus playlist, make a study snack, study in intervals, take appropriate breaks, and find your study space.

Subject: Earth Science

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Question:

Describe the three main steps of the nitrogen cycle.

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Tinamarie H.
Answer:

The three main steps are nitrogen fixing, nitrification, and denitrification. Nitrogen fixing requires anaerobic conditions to convert biologically inert N2 into bioavailable NH3 or NH4+. Nitrogen fixing occurs by both natural and industrial processes. Biologically, microbes will fix N2 to NH4+ (N2 + 8H+ -> 2NH4+). The industrial nitrogen fixing occurs by the Haber-Bosch process where an iron catalyst is used with heat and pressure to change N2 to NH3 (N2 + 3H2 -> 2NH3). Nitrification converts NH4+ and NH3 to nitrate (NO3-), where nitrogen is oxidized. Denitrification converts nitrate back to N2, where nitrogen is reduced. Anaerobic conditions and denitrifying bacteria are required for denitrification to occur.

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