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Why do lunar and solar eclipses not occur every month?

Lunar and solar eclipses occur when all three celestial bodies line up in a specific way. A lunar eclipse occurs when the moon is in its full moon phase and passes through the Earth's shadow. These eclipses can be partial or can be full depending on the alignment of the moon, Earth and where a person is viewing the eclipse. Not all eclipses are able to be viewed from everywhere on Earth, especially not at the same angle due to the shape and tilt of the Earth at the time of the eclipse. A similar alignment occurs with a solar eclipse. The moon in this case is in its new moon phase, and lin..

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What are the Appalachian Highlands?

The Northern section of the Appalachians runs from Newfoundland in Canada to the Hudson River in New York. It encompasses the Longfellow Mountains in Maine, the White Mountains in New Hampshire and the Green Mountains in Vermont.\n\nThe Central section travels from the Hudson Valley through West Virginia. This portion includes some of the Blue Ridge Mountains and the Taconic Mountains in New York.\n\nThe Southern section runs from West Virginia to the end of the range. It features the rest of the Blue Ridge Mountains as well as the Cumberland Plateau.

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Is Krakatoa active, dormant or extinct?

The northern half of the surviving volcano, Rakata, slid into the ocean, sealing the magma conduit. After 44 years of no activity, a new volcano began rising out of the collapsed caldera in 1927. This new peak, in the area between where Perboewatan and Danan were, was named Anak Krakatoa, which means "child of Krakatoa." Since 1950, it has grown at a rate of 5 inches per week and erupts infrequently.

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When a falling object has reached its terminal velocity, what is its acceleration?

Every object has a terminal velocity, which is the speed it can travel while having a constant force. When an object falls it typically accelerates as it falls, however, eventually the air resistance or drag becomes too great to allow the object to continue accelerating. This occurs when the gravitational force and drag become equal. If an object is falling under a source of power other than gravity, such as an engine, then it will take longer for it to reach its terminal velocity.

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What happens when given the balanced equation representing a reaction?

Each component of a balanced equation includes a stoichiometric coefficient in front of it. Stoichiometry allows chemists to determine how many moles of each reactant produce a certain number of moles of each product. An example of a balanced equation is CaCl2 + Na2CO3 = CaCO3 + 2 NaCl. The stoichiometric coefficient of two in front of the NaCl indicates two moles for every one molecule for the rest of the compounds in the equation.

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What are some good human body diagrams?

After clicking on specific system's tab, users can view both a 2-D interactive view or a 3-D rotate and zoom view. On the left side of the page is an anatomy explorer with links that users can click on to zoom into specific zones of the body to see every single body part, including those that are too small to see from the regular view. On the right side of the page are larger images of the body part belonging to that particular system and information about its function.

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What is a wave-cut platform?

Wave-cut platforms are more likely to develop when the cliff is made of softer stone that quickly erodes when exposed to ocean waves and the sand contained in them. A cliff made of very solid rock, such as granite, is more resistant to abrasion from the sand and surf and may not develop a wave-cut platform at all.

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What is 250 milliliters converted to milligrams?

The mass of a substance in milligrams is equal to its volume in milliliters multiplied by the density in milligrams per milliliter. Usually, densities are given in units of grams per centimeter cubed, where a centimeter cubed is the same thing as a milliliter. Multiplying a density in grams per centimeter cubed by 1000 gives the density in milligrams per milliliter. This result can then be multiplied by a volume in milliliters to give a mass in milligrams.

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What are the West region landforms?

The Mojave Desert is approximately 54,000 square miles and extends from southern California to Arizona. Death Valley is part of the Mojave Desert and is the lowest point in North America.The Colorado River has its source in the Rocky Mountain National Park in Colorado, and it flows in a southwest direction to empty into the Gulf of California. Its length is approximately 1,450 miles. The Olympic National Forest Park is situated in Washington, and the Sonoran Desert covers a large portion of the southwestern United States and parts of Mexico.

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How does a muscle cell contract?

Excitatory neurotransmitters, including acetylcholine, diffuse through the motor neuron to generate an action potential in a muscle fiber. This action potential propagates through the connective tissue sheaths of each muscle fiber. As it travels through the muscle fibers, calcium, sodium and potassium ions are released and absorbed to keep the muscle cell membrane electrically excited. Once the ion concentration in the muscle cells return to normal, the action potential slows and muscles relax.

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