Stereographic Projection of Crystal Faces
This site features a lecture by Dr. Stephen Nelson from Tulane University that explores a systematic way to define crystallographic angles. The lecture discusses crystallographic angles and gives an introduction to the use of stereographic projections for depicting the angular relationships between crystal faces. Scientific illustrations clarify the text.
Introduction and Symmetry Operations
This site consists of an introductory lecture on crystal symmetry and symmetry operations. It provides the definition of a mineral and then covers topics including different types of rotational symmetry, mirror symmetry, the center of symmetry, different types of rotoinversion, and combinations of symmetry operations. Drawings help illustrate the concepts presented in the lecture.
This site provides an illustrated lecture about ocean chemistry from a geochemistry course offered by Dr. Scott Wood at the University of Idaho. Topics include geochemical processes that occur in estuaries, halmyrolysis, the concept of residence time for elements in the ocean, the mechanisms by which elements are added to or removed from seawater, carbonate behavior in seawater and a definition of the calcite compensation depth (CCD), the role of hydrothermal processes in controlling seawater ch
The Nature of Protest
This lesson will focus on the nature of protest by examining the different avenues that people take to express their opinions.
The Spins package is a self-contained file for the teaching of measurement and time evolution of spin-1/2 systems in quantum mechanics. The file contains ready-to-run OSP programs and a set of curricular materials. The material focuses on single and multiple measurements of different ensembles of identically prepared spin-1/2 particles. The OSP Collection provides curriculum resources that engage students in physics, computation, and computer modeling. Computational physics and computer modeling
Ajakirja Eesti Loodus otsingumootor
Ajakirja Eesti Loodus otsingumootor, lühendatud aadressil jõuab ka ajakirja numbriteni
One reason why caecilians are considered to be amphibians is because they go through metamorphosis to reach adulthood. Caecilians are unique amphibians because some of them lay eggs, but some of them give birth to live young.
Butterfly pupa anatomy
The pupa is the third stage of the butterfly's life cycle. The caterpillar creates a pupa, sometimes called a chrysalis, and emerges as the adult butterfly after metamorphosis. The butterfly's wings will be used for flying.
Boy on trampoline
The boy would feel less secure if the safety net around the trampoline wasn't there. Humans have an innate need to feel secure in their environments.
Blooming prickly pear cactus (Opuntia) from the Sonora desert
Cacti are often overlooked as flowering plants. In fact, cacti bloom with colorful flowers and reproduce like all other angiosperms.
Blood flow of moving Lumbriculus
Observe blood flow and muscle contractions in each body segment of Lumbriculus variegates (note how blood flows in relation to the worm turning in the capillary tube).
Blood circulation through zebrafish
Lateral and tail view of developing Danio showing blood flow to and from the tail section.
Aquatic Animal Skeleton - Backbone
The backbone of an aquatic animal allows it to be very flexible under water. It usually extends into a tail and is classified as a gliding joint.
Fly on a leaf
Flies are insects that eat dead plant and animal material. Their ingestion and digestion of detritus leads to respiration and excretion of important nutrients back into the soil and water.
Celery in pure water
The celery stalks take up the water and continue to live in this environment.
Roots can grow in multiple directions. Just because this plant was in a cup didn't stop the roots from growing longer and creating individual branches.
The San Joaquin kit fox
San Joaquin kit foxes are nocturnal and hunt small mammals at night. They make dens and stay in them during the day to conserve water and energy.
Actual Precipitation from SSM-I: January 1997 through May 1998
Actual Precipitation using SSM-I data from 1-97 to 5-98
AMSR-E Anomalous Atlantic Sea Surface Temperature Data Used to Forecast 2003 Hurricane Season 1
Researchers and forecasters often study sea surface temperatures for an indication of hurricane potential. Scientists say above normal Atlantic Ocean temperatures is one reason for the "above normal" hurricane forecast. Hurricanes convert heat from the tropical atmosphere and oceans to wind and waves, just as a car engine converts gasoline into motion. These animations show a year in the life of global ocean temperatures, June 2, 2002 to May 11, 2003. Green indicates the coolest water, yellow th
EPTOMS Ozone (7-26-96 - 12-4-00)
This animation shows the total ozone as measured by Earth Probe TOMS since the earliest measurements by that instrument. Days on which no data was taken appear as blank.