Science

Refine Search

What is the electron configuration of beryllium?

Metals such as copper, iron, aluminum and nickel are often alloyed with beryllium to give them extra strength. The metals are then used to make tools and precision instruments.\nNicholas Louis Vauquelin discovered beryllium in 1797. Friedrich Wohler and A.A. Bussy isolated it independently in 1828.

Continue Reading

What are some facts about composite volcanoes?

Composite volcanoes are made up of multiple layers that are accumulated over multiple eruptions. A typical composite volcano has a crater at the summit of the mountain that contains either a group of vent clusters or a large, central vent. Lava from an active composite volcano can flow through cracks in the crater wall or from fissures on the central cone. This lava then hardens around the fissures and strengthens the central cone.\nA composite volcano generally has a more explosive eruption compared to a shield volcano. The eruptions of Krakatoa in 1883 A.D. and Vesuvius in 79 A.D. are record..

Continue Reading

Which flower blooms for one day?

The tropical hibiscus plant is a flowering shrub or tree. It is a warm-climate plant that does not thrive in colder conditions. While the bloom of this flower only lasts for one day, it produces enough buds for a new flower to bloom each day throughout the season. Hibiscus flowers tend to start appearing in late July or early August. A typical hibiscus plant produces more than 100 blooms in one season.\nThe Virginia spiderwort is a perennial plant that grows wild primarily in the eastern United States. This is a shrub that thrives in the shade of other trees. Its branches produce clusters of s..

Continue Reading

What is a hormone imbalance?

The condition affects both genders, explains Dr. Lee. A paucity of progesterone, a hormone that plays a critical role in pregnancy and the menstrual cycle, is the most common type of hormonal imbalance affecting women. Other forms of female hormonal imbalances include an excess of hormones known as androgens and inadequate levels of cortisol, a hormone produced by the adrenal glands that helps regulate blood sugar.\nSome types of this condition are more likely to afflict people over a certain age, states Dr. Lee. For instance, estrogen dominance, a malfunction in which levels of progesterone a..

Continue Reading

Where are the biceps and triceps located?

The biceps and triceps work together as flexors and extensors. The bulk of the posterior upper arm is taken up by the tricep muscle, which acts as the antagonist to the bicep and brachialis muscles. The two sets of muscles are separated by medial and lateral intermuscular septa. The anterior arm muscles are the flexors of the elbow joint and forearm, while the triceps, along with the anconeus to a lesser degree, are the extensors.The process by which opposing muscles on either side of a joint work together, one contracting while the other relaxes, is called reciprocal inhibition. The two types..

Continue Reading

What is an animal that stats with "X"?

The Xerus inauris are black squirrels with short, coarse hair and a white tail that extends the length of their body. They are diurnal animals, coming out of their burrows during the day to forage, groom and socialize. They prefer to live in dry areas, such as grasslands, deserts and savannah and will use their large tails for shade. The primary diet of the Xerus inauris consists of seeds, nuts, insects, leaves and grains.

Continue Reading

What does "MCL" stand for?

WebMD reports that MCL injuries usually occur when the knee is utilized during strenuous activities. Bending, twisting or changing direction quickly increase the likelihood of an MCL injury. Minor MCL injuries can heal with rest, ice treatment and use of over-the-counter anti-inflammatory medication. More severe cases require professional medical attention. Symptoms of MCL injuries include knee tenderness, pain or swelling.

Continue Reading

What are some of the uses of gypsum?

Gypsum decreases soil density making it easier to till. It decreases the amount of nitrogen, an essential element for plants, lost to the air. Seed emergence is also improved by gypsum by decreasing crust formation. The calcium in gypsum helps plants absorb more nutrients. Acidic soils are corrected with the addition of gypsum. Gypsum is mined and is extremely abundant.

Continue Reading

What is the purpose of the human eyeball?

The human eyeball is comprised of several structures. The cornea is located at the front of the eye and is a transparent structure that serves to focus incoming light. Behind the cornea is a membrane known as the iris, which contains the pupil, a circular opening that can change shape in order to control the amount of light entering the eye. The retina is found along the rear wall of the eyeball and contains millions of cells knows as rods and cones. These cells are able to translate light into electrical signals that the brain is then able to process into a visual image.\nEach eye is control..

Continue Reading

What are the stages of digestion?

The cephalic phase begins even before food is eaten. The digestive mechanism is stimulated simply by the sight, smell or even the thought of food. Digestion properly begins when the food is in the mouth and chewed, or masticated. As it's being ground down, it's moistened with saliva, which contains enzymes that change some carbohydrates into sugar.\nThe food is swallowed, and then travels down the esophagus to the stomach. This begins the gastric phase. In the stomach, the food is churned and bathed in gastric juices, which are mainly made up of pepsin and hydrochloric acid. Gastric ..

Continue Reading
Showing 8061 to 8070 of 10000 (1000 Pages)