This collection of visualizations was made from Landsat imagery. Many of these visualizations are designed to show changes in our environment through time. Subjects include glacial retreat, urban growth, landforms and coastlines, floods, fires, deforestation, volcanism, and others.

This is a hands-on lab activity about the composition of salt. Learners will explain the general relationship between an element's Periodic Table Group Number and its tendency to gain or lose electron(s), and explain the difference between molecular compounds and ionic compounds. They will then use household materials to build a model to demonstrate sodium chloride's cubic form and describe the nature of the electrostatic attraction that holds the structure of salt together. Background information, common preconceptions, a glossary and more is included. This activity is part of the Aquarius Hands-on Laboratory Activities.

Navigational tools and methods of early voyagers provide the background and contrast to the satellite images and models used today. Students complete mapping activities based on historical data from Columbus and Blith. Students will also use a computer model of ocean currents to investigate the movement of objects drifting on the ocean surface. Note that this is lesson one of five on the Ocean Motion website. Each lesson investigates ocean surface circulation using satellite and model data and can be done independently. See Related URL's for links to the Ocean Motion Website which provide science background information, data resources, teacher material, student guides and a lesson matrix.

The Adirondack Mountains tour is part of the New York Landscape Regions Collection of Google Earth Tours, created by a group of New York State science educators. This tour provides an introduction to the geology of the Great Range and the High Peaks as viewed from Algonquin Peak. It also addresses the issue of acid rain, which is a persistent environmental concern in the Adirondacks.

The Allegheny Plateau tours are part of the New York Landscape Regions Collection of Google Earth Tours, created by a group of New York State science educators. These tours showcase examples of Allegheny geology, including the geomorphology of glacial features near Tully, New York, southern Cayuga Lake, the geology and geomorphology of Letchworth State Park and its waterfalls, as well as waterfalls and creeks in the Ithaca Gorges. Schoharie Creek can be toured from its mouth to its source, the St. Lawrence Chesapeake and Valley Heads Moraine can be investigated to examine drainage patterns, and another tour investigates the unique geology and ecology of the Rome Sand Plains. Environmental tours also address the 2006 flooding in the Allegheny Plateau near Port Jarvis and Livingston Manor and provide an overview of the water supply system of the City of New York.

The Atlantic Coastal Plain tour is part of the New York Landscape Regions Collection of Google Earth Tours, created by a group of New York State science educators. This tour introduces students to glacial erratics on Long Island, the Ronkonkoma terminal moraine, and the Rock Hill erratic. Coastal erosion and deposition can be studied by viewing dunes, beaches, and wave cut banks.

The Champlain Lowlands tour is part of the New York Landscape Regions Collection of Google Earth tours, created by a group of New York State science educators. This tour includes views of the gorge of the Ausable River, cut through Late Cambrian Potsdam Sandstone, and the geology of the Champlain Thrust Fault, a low angle thrust fault formed as the proto-Atlantic Ocean closed during the Taconic Oregeny. When it was still connected to the ocean, Lake Champlain was home to whales, whose fossils are now entombed in the lake sediments. The tour also includes classroom activities for students.

The Erie Ontario Lowlands tour is part of the New York Landscape Regions Collection of Google Earth tours. This tour includes glacial history, features, and views of Niagara Falls, the Niagara Escarpment, current and former spillways, and the locks at Lockport, New York. Students can also learn about the geology and glacial history of Canandaigua Lake, one of New York's Finger Lakes, which discharges into the Lowlands. There is also a lab activity in which students analyze maps, images, and information to perform an environmental assessment of the Cascade Mill development.

The Hudson Highlands tour is part of the New York Landscape Regions Collection of Google Earth Tours, created by a group of New York State science educators. This tour introduces Hudson Highlands geology, including glaciology at Bear Mountain, views of the Highlands, and the Ramapo Fault to the south. It also offers other information about the area, including some animals, New York City's water supply, and the Great Swamp.

The Hudson Mohawk Lowlands tour is part of the New York Landscape Regions Collection of Google Earth tours, created by a group of New York State science educators. This tour introduces students to limestone quarrying along the western shore of the Hudson River south of Catskill, New York. They can follow the courses of the Mohawk River and Erie Canal eastward to the Cohoes Falls and the confluence of the Mohawk with the Hudson River. It also provides a look at issues involved with the cleanup of PCB-laden sediments in the Hudson River.

The Newark Lowlands tour is part of the New York Landscape Regions Collection of Google Earth Tours created by a group of New York State science educators. This tour lets students see the Ramapo Fault at the Lowlands' northwestern boundary and the Palisades Sill on the western shore of the Hudson River. The Sparkill Gap, a pre-Ice Age weak spot in the Palisades Sill through which the Hudson River once flowed, can be observed. There is also an activity in which students explore the economic, social, and environmental issues associated with constructing the Tappan Zee Bridge over the Hudson River.

The St. Lawrence Lowlands tour is part of the New York Landscape Regions Collection of Google Earth Tours. This tour allows students to explore the Thousand Islands, formed of granite which has withstood the erosive energy of the St. Lawrence River, creating thousands of islands ranging in size from single rocks to over 25 square miles. There is also an activity in which students map some of the many shipwrecks that have accumulated at the entrance to the St. Lawrence Seaway.

The Taconic Mountains tour highlights the geology and natural environment of several landscape regions, including the structure of the Highlands Province basement rocks, which were affected by the Taconic Orogeny. Students can view biotite-rich schists and the tight isoclinic folds of the Walloomsac Formation, as well as the Taconic angular unconformity at the south end of Becraft Mountain. Bedding thrusts are also evident within the Roundout Formation and overlying Manlius Formation. They can also examine metamorphosed Briarcliff Dolostone containing yellow, white and black chert layers and Everett Phylite, which represents a metamorphic lithologic transition from slate to phyllite. Dramatically folded calcareous rocks are visible at the Bennington, Vermont bypass, and students can also view Stark's Knob, where pillow lavas formed as Ordovician basalts erupted under the waters of a shallow sea.

The Manhattan Prong tour is part of the New York Landscape Regions Collection of Google Earth Tours. This tour takes students to Central Park in New York City to see metamorphic rock, glacial features, differential weathering, and Cleopatra's Needle, an Egyptian obelisk brought to the city in 1881. They can also examine bedrock, float, mass wasting, jointing, and glacial polish in the Pound Ridge Reservation, and observe a metamorphic outcrop of Fordham Gneiss near Katonah, New York. The convergent boundary features of the Staten Island serpentine belt, formed during the Taconic Orogeny, can be viewed, and students can follow the Mianus River Gorge as it crosses the Cameron's Line fault. There is also a tour of the New York City water supply system with a lab activity to accompany it.

The Tug Hill Plateau tour is part of the New York Landscape Regions Collection of Google Earth Tours, created by a group of New York State science educators. The tour introduces students to the many waterfalls of the plateau, which is formed of layers of sandstone and shale. It also points out that the plateau recieves more snow than any location east of the Rocky Mounatins due to the lake-effect from Lake Ontario and its elevation, which is 2,100 feet at the highest point. There is also a visit to a fish hatchery.

In this activity, students view a satellite image of Earth at night, and consider the environmental considerations and consequences associated with the pattern of light they see. The resource includes a map for student use. Summary background information, data and images supporting the activity are available on the Earth Update data site. To complete the activity, students will need to access the Space Update multimedia collection, which is available for download and purchase for use in the classroom.

This module provides an overview of the nitrogen cycle and the chemical changes that govern the cycle.

This course provides an introduction to nonlinear dynamics and chaos in dissipative systems. The content is structured to be of general interest to undergraduates in science and engineering. The course concentrates on simple models of dynamical systems, mathematical theory underlying their behavior, their relevance to natural phenomena, and methods of data analysis and interpretation. The emphasis is on nonlinear phenomena that may be described by a few variables that evolve with time.

In this experiential activity, students demonstrate to themselves the effect of the optic disc, or blind spot, inherent to the optic nerve entering the posterior of the eye (bulbus oculi). This resource is from PUMAS - Practical Uses of Math and Science - a collection of brief examples created by scientists and engineers showing how math and science topics taught in K-12 classes have real world applications.

This lesson is an introduction to the structure and function of DNA including the process of DNA replication.