Below are some resources that you might like to use for your inquiry. It is not an exhaustive list but will provide you with a starting point. If you find other resources or videos that you find useful, please let your teacher know and she will add them to this list.
General – basic facts about coral reefs
http://www.defenders.org/coral-reef/basic-facts This is a basic overview about coral reefs with information about things like behavior and diet and where they are in the world. Go to the ‘More on coral reefs’ box where there are links to information about threats, what is being done to help and what you can do etc.
http://www.ecokids.ca/pub/eco_info/topics/oceans/coral_reefs.cfm A kids’ website about coral reefs
http://www.coral-reef-info.com Good overview about coral reefs, easy to read and looks at distribution across the world.
http://animals.nationalgeographic.com/animals/invertebrates/coral/ National Geographic overview about coral
Why coral reefs are important to the environment and people
http://wwf.panda.org/about_our_earth/blue_planet/coasts/coral_reefs/coral_facts/ This is a really good overview with statistics about why coral reefs are financially and biologically valuable to people
http://oceanservice.noaa.gov/education/kits/corals/coral07_importance.html This is about the importance of coral reefs for biodiversity and economies
Threats to coral reefs
http://www.defenders.org/coral-reef/threats Overview of the threats to coral reefs such as warming waters and ocean acidification
https://www.bbcearth.com/blog/?article=saving-coral - Threats to coral and saving coral
http://oceanservice.noaa.gov/education/kits/corals/coral08_naturalthreats.html This explains some of the natural threats to coral reefs such as tidal emersions and weather
http://oceanservice.noaa.gov/education/kits/corals/coral09_humanthreats.html This explains some of the human-caused threats to coral reefs
Climate Change, Ocean Acidification and Warming waters
http://sitemaker.umich.edu/gc2sec7labgroup3/climate_change This is a good over view from the University of Michigan about the impact that humans and climate change is having on Great Barrier Reef in Australia
http://www.reefresilience.org/coral-reefs/stressors/climate-and-ocean-change/ This is a pretty comprehensive look at the impact that climate change and related issues are having on coral reefs. There are some videos and extra resources at the bottom of the page too.
http://www.reefresilience.org/coral-reefs/stressors/bleaching/ This looks at the causes and problem of coral bleaching
Overfishing
https://oceanservice.noaa.gov/facts/coral-overfishing.html - An infographic with useful data on.
http://www.reefresilience.org/overfishing-and-destructive-fishing-threats/ Overfishing is one of the most damaging things to coral reefs and their ecosystems. This has some excellent summarizing information and links to more resources at the bottom of the page.
https://seashepherd.org/news/sea-shepherd-launches-operation-reef-defense-campaign-in-hawaii/ This is a brief overview by Sea Shepherd about the impact overfishing has on coral reef health.
http://www.ibtimes.com/caribbean-coral-reefs-could-vanish-20-years-due-overfishing-tourism-report-1617546 This article looks at the possibility that coral reefs could vanish in 20 years due to overfishing.
Coral reef wildlife trade / trafficking
http://www.defenders.org/sites/default/files/publications/ecological-impacts-and-practices-of-the-coral-reef-wildlife-trade.pdf This is everything you probably need to know about the coral reef wildlife trade. It includes a very detailed summary and some case studies with diagrams and data.
http://www.seashepherd.org/reef-defense/aquarium-trade.html This is another comprehensive bullet point overview of the effects of coral reef trafficking
http://issues.org/17-1/bruckner/ A good overview of the trade and also looks at what the US is doing to try to stop it.
Actions to protect Coral Reefs
http://video.nationalgeographic.com/video/magazine/150115-ngm-coral?utm_source=Facebook&utm_medium=Social&utm_content=link_fbp20150130video-coralreefs&utm_campaign=Content&sf7189976=1
This looks at American Scientists who are trying to re-grow coral reefs