How can we help?

You can also find more resources in our Help Center.

CH 11

STUDY
PLAY
biome
a region with a certain climate and certain forms of vegetation
desert
an area that receives less than 25 cm of rain per year
canopy
a leafy roof formed by tall trees in a forest
understory
a layer of shorter plants that grow in the shade of a forest canopy
grassland
an area populated by grasses and other nonwoody plants most grassland get 25 to 75 cm of rain each year
savanna
a tropical grassland with scattered clumps of trees
deciduous tree
a tree that sheds its leaves and grows new ones each year
coniferous tree
a tree that produces its seeds in cones and that has needle-shaped leaves
tundra
a polar climate region, found across northern Alaska, Canada, and Russian, with short, cool summers and bitterly cold winters; an extremely cold, dry biome
permafrost
permanently frozen soil found in the tundra climate region
estuary
a habitat in which the fresh water of a river meets the salt water of the ocean
intertidal zone
an area that stretches from the highest high-tide line on land out to the point exposed by the lowest low tide
neritic zone
the region of shallow ocean water over the continental shelf
kelp forests
marine ecosystem where large, brown algae called giant kelp grow
coral reefs
a structure of calcite skeletons built up by coral animals in warm, shallow ocean water
plankton
tiny algae and animals that float in water and area carried by waves and currents
renewable resource
a resource that is either always available or is naturally replaced relatively quickly
clear-cutting
the process of cutting down all the trees in an area at once
selective cutting
the process of cutting down only some trees in an area
sustainable yield
amount of a renewable resource harvested regularly without reducing future supply
fishery
an area with a large population of valuable ocean organisms
aquaculture
the farming of water organisms
biodiversity
the number of species in an area
keystone species
a species that influences the survival of many other species in an ecosystem
extinction
the disappearance of all members of a species from Earth
endangered species
a species in danger of becoming extinct in the near future
threatened species
a species that could become endangered in the near future
habitat destruction
loss of a natural habitat
poaching
illegal killing or removal of wildlife
captive breeding
the mating of animals in zoos or wildlife preserves