Science

Refine Search

What are the folds in the brain called?

Additional gyri and sulci do not form when people learn, but changes in the brain do occur in the form of brain plasticity. This results in the addition of more synapses and blood cells that support neurons. The brain of a fetus is smooth and tiny, but it is as wrinkled as an adult brain by 40 weeks, as the neurons create gyri and sulci by growing and migrating to different parts of the brain.

Continue Reading

What does the uvula do?

The uvula is a small process of the soft palate that occupies a spot near the top of the throat between the tonsils. It contains a small muscle that can expand and contract to change the geometry of the uvula or to press it firmly against the back of the throat.\nThe uvula is usually static, moving only as the throat expands as when swallowing. As a normal part of the swallowing process, the soft palate recedes from the base of the tongue and opens a clear path to the esophagus. The uvula is lifted by this motion and comes to rest against the nasopharyngeal opening, the passage leading from th..

Continue Reading

What is the difference between satin and brushed nickel?

Satin nickel isn't technically a metal itself, but a nickel plating that is applied to pulls, handles and knobs through electrolysis and then treated with lacquer to dull the surface a little bit.Brushed nickel receives its unique look when a wire brush is used to create abrasions on the surface, which is meant to get rid of its natural, more polished look.

Continue Reading

What are the general characteristics of the phylum Platyhelminthes?

Platyhelminthes share a few other characteristics that make them unique. Their bodies are bilaterally symmetrical along the horizontal, meaning that when their bodies are folded, the left and right edges touched, making the two edges look the same. This is considered an evolutionary advancement over older phylums, which are radially symmetrical. Radial symmetry is when the body can be folded over like segments of a circle. One example of an animal with radial symmetry is the starfish.\nPlatyhelminthes have simple eye spots for detecting light, organs that are considered an early evolutionary f..

Continue Reading

Who discovered the sun?

Galilei was able to see sunspots, solar flares and solar prominences with the first low-powered telescopes. Galilei's "Letters on Sunspots" was published in 1613 amid debate from the German Jesuit astronomer Christoph Scheiner.\nScientists theorize that the sun formed approximately 4.6 billion years ago from a rapidly rotating cloud of gas.

Continue Reading

What is the chemical name for NO3?

Compounds such as potassium nitrate (KNO3), sodium nitrate (NaNO3) and ammonium nitrate (NH4NO3) are nitrates. Compounds containing nitrates are used as fertilizers as they are highly soluble in water and contain nitrogen, which is needed by plants. Nitrates are used in the manufacture of explosives such as nitroglycerin and nitrocellulose. Sodium nitrate is used in the glass and ceramics industry. Nitrates are found naturally in the earth’s crust in the form of nitrate salts.

Continue Reading

How is ATP made?

ATP is found in all living cells and cells continuously break down ATP for energy. ATP fuels transmission of nerve impulses, muscle contractions, formation of nucleic acids and many other metabolic reactions. ATP molecules are made up of carbon, hydrogen, oxygen, nitrogen and phosphorus atoms.\nATP does not store energy, but when energy is needed, ATP delivers it to the places within the cell where energy is being consumed. ATP is a nucleotide made up of a nitrogenous base, ribose and a chain of three phosphate groups that are bound to the ribose. Energy is released when the phosphate bonds ar..

Continue Reading

How do earthquakes change the Earth?

Earthquakes are caused by either volcanic activity or shifting of massive tectonic plates underneath the surface of the earth. The plates have a ton of pressure and are pressing against each other, and when the plates suddenly shift it causes the entire ground to move, shake or break apart.There are plenty of earthquakes that occur that are so mild that no damage is done, but some earthquakes make the ground shake so violently that it destroys entire landscapes and environments. Most human deaths from earthquakes are a result of earthquakes knocking down buildings or manmade structures. Howeve..

Continue Reading

What causes seismic waves?

Actions triggering seismic waves also determine their frequency and strength. Earthquakes, common sources of seismic waves, generate surface and body waves. Large earthquakes produce waves of greater force and length. Some geologists refer to seismic waves as ambient waves, as they derive from low-frequency energy sources. Seismic waves come in the form of primary waves and secondary waves. Secondary waves follow larger primary waves, delivering less force and power.

Continue Reading

What is the definition of electrostatic attraction?

The strength of the electrostatic forces between two atoms is determined by the size of each atom's charge and the distance between the two atoms. A very positive atom right next to a very negatively charged atom will have a strong electrostatic attraction while they would have a much smaller attraction if spaced far apart. The atoms may be drawn to each other depending the the strength of other forces acting on the atoms.

Continue Reading
Showing 2131 to 2140 of 10000 (1000 Pages)