This encyclopedia entry is for the term "autotroph." An autotroph is an …
This encyclopedia entry is for the term "autotroph." An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedia entry for "biosphere." The biosphere is made up …
This is an encyclopedia entry for "biosphere." The biosphere is made up of the parts of Earth where life exists. The biosphere extends from the deepest root systems of trees, to the dark environment of ocean trenches, to lush rain forests and high mountaintops. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedia entry for the term "carnivore." A carnivore is …
This is an encyclopedia entry for the term "carnivore." A carnivore is an organism that mostly eats meat, or the flesh of animals. Sometimes carnivores are called predators. Text for this entry is appropriate for upper elementary, middle, and high school grade levels.
This is an encyclopedia entry for the term "ecosystem." An ecosystem is …
This is an encyclopedia entry for the term "ecosystem." An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Text for this entry is appropriate for the middle and high school grade levels.
This encyclopedia entry is for the term "food chain." A food chain …
This encyclopedia entry is for the term "food chain." A food chain describes who eats whom in the wild. Text for this entry is appropriate for the upper elementary, middle and high school grade levels.
This encyclopedia entry is for the term "Fossils." Fossils are the preserved …
This encyclopedia entry is for the term "Fossils." Fossils are the preserved remains, or traces of remains, of ancient animals and plants. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedia entry for the term "groundwater." Groundwater is all …
This is an encyclopedia entry for the term "groundwater." Groundwater is all the water found underneath the Earth?s surface. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedia entry for "habitat." A habitat is a place …
This is an encyclopedia entry for "habitat." A habitat is a place where an organism makes its home. Text for this entry is appropriate for middle and high school levels.
This is an encyclopedia entry for the term "herbivore." An herbivore is …
This is an encyclopedia entry for the term "herbivore." An herbivore is an organism that mostly feeds on plants. Text for this entry is appropriate for the upper elementary, middle, and high school grade levels.
This is an encyclopedia entry for "keystone species," a plant or animal …
This is an encyclopedia entry for "keystone species," a plant or animal that plays a unique and crucial role in the way an ecosystem functions. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedia entry for the term "mantle." The mantle is …
This is an encyclopedia entry for the term "mantle." The mantle is one of the three main layers of the Earth. Text for this entry is appropriate for the middle and high school grade levels. An accompanying image set provides graphics to add to a lecture on the layers of the Earth.
This is an encyclopedia entry for the term "marine sanctuary." A marine …
This is an encyclopedia entry for the term "marine sanctuary." A marine sanctuary is a general type of marine protected area (MPA). The Flower Garden Banks National Marine Sanctuary and the Pelagos Sanctuary for Mediterranean Marine Animals are featured. Text for this entry is appropriate for the middle and high school levels.
This is an encyclopedia entry for "marsh." A marsh is a wetland, …
This is an encyclopedia entry for "marsh." A marsh is a wetland, an area of land where water covers ground for long periods of time. Text is appropriate for middle and high grade levels.
This is a comprehensive encyclopedia entry that contains information about marine ecosystems, …
This is a comprehensive encyclopedia entry that contains information about marine ecosystems, ocean zones, ocean currents, marine resources, and environmental issues associated with oceans. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedia entry for the term "omnivore." An omnivore is …
This is an encyclopedia entry for the term "omnivore." An omnivore is an organism that regularly consumes a variety of material, including plants, animals, algae, and fungi. Text for this entry is appropriate for upper elementary, middle, and high school grade levels.
This encyclopedia entry is for the term "ozone layer." The ozone layer …
This encyclopedia entry is for the term "ozone layer." The ozone layer is one layer of the stratosphere, the second layer of the Earth?s atmosphere. The stratosphere is the mass of protective gases clinging to our planet. This entry discusses what the ozone layer does for us and how we are impacting the layer. Text for this entry is appropriate for the middle and high school grade levels.
This encyclopedia entry is for the term "precipitation." Precipitation is any type …
This encyclopedia entry is for the term "precipitation." Precipitation is any type of water that forms in the Earth's atmosphere and then drops onto the surface of the Earth. Water vapor, droplets of water suspended in the air, builds up in the Earth's atmosphere. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedia entry for the term "rain." Rain is liquid …
This is an encyclopedia entry for the term "rain." Rain is liquid precipitation: water falling from the sky. Raindrops fall to Earth when clouds become saturated, or filled, with water droplets. Text for this entry is appropriate for the middle and high school grade levels.
This is an encyclopedic entry for the term "silt." Silt is a …
This is an encyclopedic entry for the term "silt." Silt is a solid, dust-like sediment that water, ice, and wind transport and deposit. Silt is made up of rock and mineral particles that are larger than clay but smaller than sand. Text for this entry is appropriate for the middle and high school grade levels.
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