a major warm ocean current flowing northeastward off the east coast of North America

a cold ocean current flowing southwestward off the west coast of South America

a warm ocean current that circulates around the Arctic region

a major river that flows through the Gulf of Mexico

a single food chain in an ecosystem

the whole group of interacting food chains in an ecological community

a diagram showing the flow of energy in a food chain

the process of photosynthesis in plants

is the continuous movement of water on, in and above Earth.

is the process of water evaporating and then falling as rain.

is the method by which plants absorb water from the soil.

is the phenomenon of water freezing into ice during winter.

a plant or animal that requires complex organic compounds for food, which it obtains by preying on other living things or eating particles of organic matter

organisms that produce their own food through photosynthesis

decomposers that break down dead organic material

organisms that primarily feed on inorganic substances

plant-like plankton.

animal-like plankton.

bacteria-like plankton.

fungus-like plankton.

a large natural or artificial lake used to store water.

a small pond for recreational fishing.

a type of water purification system.

a structure for collecting rainwater.

life found in the ocean; salt water organisms

organisms that live in freshwater environments

plants that grow on land

animals that can survive in extreme temperatures

a large deep section of the ocean

a shallow area of a river

a type of mountain range

a flat area of land

a small body of still water formed naturally

a large body of salt water

a type of aquatic plant

a man-made water reservoir

Organisms that produce their own food through photosynthesis

Organisms that consume living plants and animals

An organism (such as a bacterium or a fungus) that lives on and decomposes dead organisms

Organisms that break down inorganic materials in the soil

a large natural stream of water flowing in a channel to the sea, a lake, or another such stream.

a small body of water surrounded by land.

a man-made structure for storing water.

a large area of land that is very dry and receives little rainfall.

floating plant and animal organisms in the ocean

large marine mammals that swim in the ocean

tiny rocks and minerals found on the ocean floor

coral reefs that provide habitat for fish

a long, deep, narrow canyon in the seafloor plain; deepest feature in the ocean is the Mariana Trench (7 miles)

a shallow area of the ocean where sunlight penetrates and supports marine life

a large body of saltwater that covers most of the Earth's surface

a region of the ocean where tectonic plates converge and create volcanic activity

A structure built to store water

A shaft sunk into the ground to obtain water, oil or gas.

A type of water purification system

A device used for measuring water levels

the seafloor that is relatively flat; average depth is 2.5 miles

a steep underwater cliff

a shallow coastal area

a region of the ocean with high volcanic activity

a large body of water surrounded by land.

a small stream of water flowing through land.

a body of salt water smaller than an ocean.

a wetland area filled with marshy vegetation.

A tool used to classify living things by making choices between pairs of phrases or descriptions.

A method for identifying species based on genetic analysis.

A chart that shows the evolutionary relationships between different species.

A database of all known species of plants and animals.

a process where the gas (water vapor) is cooled and changed back to a liquid.

a process where liquid water is heated and turned into vapor.

a process where solid ice is melted into liquid water.

a process where water is evaporated into the atmosphere.

the sequence of transfers of matter and energy in the form of food from organism to organism.

a diagram that shows the flow of energy in an ecosystem.

a type of food that is consumed by all living organisms.

the process of photosynthesis in plants.