Ecosystems
Energy
Air, Water, Earth
Populations
Global Change
100
This biome is characterized by a having a layer of soil called permafrost.
What is the tundra?
100
This energy source is used to generate electricity with photovoltaic (PV) cells.
What is solar energy?
100
This is the most abundant gas in the atmosphere.
What is nitrogen?
100
This type of species provides extended parental care, has only 1-2 babies at a time and are generally specialist species.
What are K-related species?
100
This greenhouse gas has no natural source.
What are chlorofluorocarbons (CFCs)?
200
This type of species has an unusually large impact on its ecosystem and its loss can therefore be devastating to the rest of the ecosystem.
What is a keystone species?
200
This type of energy utilizes heat that is stored beneath Earth’s surface to heat water and produce steam.
What is geothermal energy?
200
This is the ability of water to move (or not) through soil.
What is permeability?
200
This is the stage of demographic transition for this country. 
What is Stage 2?
200
This international agreement aimed at reducing greenhouse gas emissions and combating climate change.
What is the Kyoto Protocol?
300
This rule states that 90% of useable energy is "lost" as heat when passed on in a food chain.
What is the 10% rule?
300
At this site a 9.0 magnitude earthquake, which occurred at a nearby subduction zone, triggered one of the largest nuclear reactor disasters in history.
What is Fukushima Daiichi Nuclear Plant in Japan?
300
This type of irrigation is often used by small-scale farming operations, is the most water efficient and requires extensive labor to set up individual irrigation lines.
What is drip irrigation?
300
One these age structure diagrams, what group in the population do the blue bars represent?
What are the elderly or post-reproductive age group?
300
This is the #1 threat to biodiversity today.
What is habitat destruction?
400
This biogeochemical cycle is powered by the Sun
What is the hydrological (water) cycle?
400
In this type of reaction, where fossil fuels are burned, carbon dioxide and water are the products.
What is a combustion reaction?
400
This is a massive displacement of water, most often caused by an underwater earthquake, that causes a series of high-energy waves.
What is a tsunami?
400
This is the total number of babies born per woman in a population.
What is the total fertility rate?
400
Anaerobic decomposition of garbage in landfills is a source of this greenhouse gas.
What is methane?
500
This is a measure of the number of different species in an area and is a component of biodiversity.
What is species richness?
500
Identify one energy source that does not directly rely on the Sun as its ultimately source.
Hydrogen fuel cells, nuclear, geothermal or tidal power
500
This is a region that is the most geologically active place on Earth
What is the Ring of Fire?
500
During this stage of demographic transition, the birth rate drops to 0.
What is Stage 4?
500
what acid is formed when carbon dioxide dissolves in ocean water?
What is carbonic acid?