This NASA site describes long-term changes in Earth’s magnetic field, and how magnetic stripes in the Atlantic seafloor provide evidence for reversals of this field. The site presents a model of Earth’s interior that helps explain how Earth’s magnetic field is generated and how the reversals occur. A computer-generated image shows the complicated magnetic field in-between reversals.
This site looks at the future management of ground water and surface water in the United States and addresses the need for greater understanding of the interaction of ground and surface water with respect to the three issues of: water supply, water quality, and characteristics of aquatic environments. Special attention is given to the preservation of wetlands and riparian zones.
The 1950 eruption was the largest and most spectacular eruption from the southwest rift zone of Mauna Loa Volcano, Hawaii, since written records have been kept. It was especially noteworthy, for lava was erupted from a nearly continuous 20-km-long fissure along the middle portion of the rift zone. Flows reached the sea in less than four hours. The description includes 5 photographs, a map of a portion of the southwest rift of Mauna Loa showing the 1950 flows and place names, and a relief map showing distribution of 1950 flows with labels for named flows.
This article profiles the work of Elise Knittle, whose research specialty is mineral physics. The essay gives an overview of the core, mantle, and crust of the Earth, including what we know about their physical properties. It explains the work of the author, studying the chemical interactions between the metals that make up the Earth’s core and the silicate minerals that compose the mantle. The obstacles and challenges she faces in re-creating the intense heat and pressure of the deep Earth using incredibly small samples are explained.
This section of the Windows to the Universe web site provides information and images about the solar interior including detailed information about the different zones within the Sun, how energy is produced in the Sun through fusion reactions, and how energy is transferred from the core to the radiation zone and convective zone. Windows to the Universe is a user-friendly learning system pertaining to the Earth and Space sciences.
Figure 2: The brain and the subventricular zone. Legend: A: sagittal depiction of the brain and the subventricular zone (SVZ)-rostral migratory stream (RMS). B: a diagram of the adult SVZ. Ependymal (E) cells border the lateral ventricle (LV). Astrocytes (Astro) (neural stem/progenitor cells) surround a cluster of neuroblasts (N) and transit amplifying cells (T). Both astrocytes and neuroblasts have GABAA receptors, and astrocytes also have GABA transporters. C: structure of a portion of a hepatic lobule.