The adult frog now lives on land and has nostrils and lungs to breathe air. It also has front and hind legs to hop around on. This frog can start the life cycle over again by laying eggs and reproducing.
CK-12 Earth Science Honors For Middle School covers the study of Earth - its minerals and energy resources, processes inside and on its surface, its past, water, weather and climate, the environment and human actions, and astronomy.
CK-12 Earth Science For High School covers the study of Earth - its minerals and energy resources, processes inside and on its surface, its past, water, weather and climate, the environment and human actions, and astronomy.
CK-12 Earth Science For Middle School covers the study of Earth - its minerals and energy resources, processes inside and on its surface, its past, water, weather and climate, the environment and human actions, and astronomy.
Frogs lay eggs to reproduce. They lay them in water in large clumps so it is harder for predators to ingest, or eat, the eggs.
A tadpole next turns into a froglet. Its lungs start developing, its tail will start shrinking, hind legs will develop, and front legs develop later.
The life cycle of a frog includes the egg stage, tadpole stage, froglet stage, and adult frog stage. Tadpoles live in water and use gills to breathe. They develop lungs as they mature into frogs and live on land.
A tadpole is what hatches out of the egg that was laid by the adult frog. It lives in water and swims using its tail. It has gills and breathes underwater.
This video from a WPSU documentary Liquid Assets shows the transformation of Las Vegas’ water infrastructure. A desert community, Las Vegas is reducing water consumption and re-using wastewater, making optimal use of limited water resources.
Believe it or not, your life depends on algae! Join Scripps' Institution's Russell Chapman as he discusses the important roles algae have played in the development of life as we know it. (55 minutes)
The Chukchi Sea, a broad and shallow sea between Siberia and Alaska, has a profound influence on Arctic climate and on the supply of fresh water and nutrients to the Arctic Ocean. Join Scripps Oceanography geophysicist Neal Driscoll as he presents research findings from two Arctic cruises onboard the U.S. Coast Guard icebreaker Healy that provide intriguing new insightsinto the complex climatic and sea level history of the Arctic. (55 minutes)
Engineers work in many fields associated with precipitation. Engineers study glaciers to better understand their dates of formation and current demise. They deal with issues of pollution transport and water yield, and they monitor reservoirs and dams to prevent flooding.
In this hands-on OLogy activity, kids learn what happens when the rush of freshwater from a river collides with the gush of the ocean's tides. The activity begins with kid-friendly introductions to estuaries, salinity, and density. The illustrated, step-by-step directions show kids how to test the density of water at different levels of salinity and then investigate how a liquid's density affects the objects placed in it. It includes a fun look at the Dead Sea (Super Salty Sea) and why you can float effortlessly in it.
In this video segment from Planet H20: Water World, experts and teens inside and outside the Great Lakes watershed provide different perspectives on sharing the water from one of the largest bodies of fresh water in the world.
