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What kind of stress occurs at a divergent plate boundary?

This tensional stress causes the block of ground in between the plates to sink and magma from the planet's interior to rise up and fill the resulting cracks. This forms new crust, which has tensional stress applied to it as well. The sinking block is called a graben, and volcanoes can form alongside it. The ground in between divergent plate boundaries is called a normal fault. The geographical feature formed by a fully stretched block of ground in a divergent fault is called a rift.

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What does a thermometer measure?

A red or silver line in a bulb thermometer goes up if the temperature increases or down if it decreases.\nSpring thermometers are less accurate than bulb thermometers and use coiled, temperature-sensitive pieces of metal. One end of a coil is connected to a pointer that moves higher or lower depending on the temperature.\nIn the United States, thermometer measurements are usually calculated in degrees Fahrenheit. Most other countries, along with the scientific community, use degrees Celsius, although some scientists use Kelvin.

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Why are my feet really veiny?

Women are more likely to develop varicose veins than men, especially during pregnancy. However, it also occurs naturally as bodies age. More serious causes of varicose veins include damage to deep veins, perforation of veins, blood clots and, in rare case, tumors. One way to prevent varicose veins is regular exercise. Contact a doctor if you believe the problem may be serious or you are experiencing other symptoms.

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What is the purpose of a microscope?

A microscope is a device used to render objects too small for the naked eye visible. Microscopes are divided into optical or non-optical groups. The optical group is the largest using lenses and ambient light to view objects. Non-optical microscopes using vibrations or radiation to project an image such as an ultrasound scan. Optical microscopes vary in configuration and range of magnification. Compound microscopes can have a single optical path while a stereo microscope has two optical paths creating the image. Zacharias Jansen, and his father, first began experimenting with lenses in the 159..

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What are some examples of parasitism?

In addition to parasitic worms, there are parasitic vertebrates and plants. One example of a vertebrate parasite is the lamprey that feeds itself by attaching to other fish and sucking blood and other fluids from them. Mistletoe is one example of a parasitic plant; it is spread by birds, then it attaches to a tree to utilize its resources.

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Does sound travel faster in cold air?

Since both sound and heat are forms of kinetic energy, the level of heat directly affects the transmission of sound. This is because molecular motion is increased as heat is applied. Molecules that vibrate faster have an accelerating effect on any vibrating sound waves that are passing through the area. Other factors, such as humidity and barometric pressure, also affect the rate at which sound travels.

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What function do mitochondria perform?

Mitochondria are found only in cells with nuclei. A typical animal cell has between 1,000 and 2,000 mitochondria. Mitochondria specifically perform respiration, which uses oxygen to release energy from molecules and bind it into a new form. Respiration is the most efficient way of producing energy available to most cells. Cells that have frequent need to use energy aerobically produce more mitochondria.

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What is the full weight of a 30-pound propane tank?

A 7-gallon bottle of propane is often used for occasions such as RV travel, grilling and camping. This size propane bottle or tank holds roughly 640,500 BTU when filled to capacity. A 10-gallon bottle of propane holds roughly 40 pounds of propane and weighs 70 pounds when full. A small bottle of propane, such as a 5-gallon bottle, holds 20 pounds of propane and weighs 40 pounds when full. Propane bottles and tanks are always filled by weight.

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What is an example of nuclear energy?

Fusion involves the collision of atomic nuclei, an event that creates a tremendous amount of heat. In generating electricity, for instance, the heat created by fusion warms water to the boiling point, which releases steam. This steam powers turbines that create electricity.\nIn the core of the sun, the heat and pressure are extreme enough to create the fusion needed to unleash its natural nuclear energy. Less than 8 percent of the energy needs in the United States are met via nuclear energy, according to the U.S. Department of Energy. Petroleum, natural gas and coal are the primary energy reso..

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What is the difference between soil and sand?

Sand can also be found in the form of calcium carbonate, a material that is created from many different forms of life that have existed throughout the last half billion years. Some of these examples are shell and coral fish.\nSoil also consists of organisms that help to support plant life, performing many important functions. Some of these organisms are insects, bacteria, fungi and burrowing animals. Soil is responsible for storing water, supply and purification, plant growth and modification of the atmosphere.

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