Science

Refine Search

How was Mount Kilimanjaro formed?

Mount Kilimanjaro emerged from fault movement along part of the Great Rift Valley. The movement occurs in a subduction zone, an area where the oceanic crust descends below the continental crust. As the oceanic slab sinks, magma rises through the porous rock, aiding in the descent of the crust. As magma rises past the crust, it enters an area of the rock known as the mantle, where it pools and adds some of the mantle rock and gases to its composition. Eventually, the built-up magma reaches a high enough pressure that it explodes violently, in what geologists refer to as an explosive eruption. F..

Continue Reading

Why does rubbing your hands together make them warmer?

Friction is a force, and it tries to prevent objects from moving. Friction has benefits as well as negative consequences. This force exists in all mechanical objects where two or more moving parts have contact with each other. This causes parts to break down quickly unless a lubricant is used to reduce the friction. The friction between a car's tires and the road is the primary reason a car doesn't slide on a wet road or while going around a corner.

Continue Reading

Why is stoichiometry important?

Stoichiometry means "element measurement" in Greek and is also known as Mass Relations. The principles of stoichiometry are based on the Law of Conversation of Mass, the Law of Multiple Proportions, and the Law of Constant Composition. In order to satisfy all three laws, every chemical reaction and corresponding equation needs to have a set molar ratio for its reactants and products that explains how it proceeds to completion every time. Once determined, the molar ratio for an equation does not change as long as the equation itself is untouched and no other chemicals are added to the reaction...

Continue Reading

What percent of the Earth is made up of water?

The U.S. Geological Survey reports that ice caps, glaciers and permanent snow constitute about 69 percent of Earth's freshwater. Groundwater accounts for about 30 percent of freshwater, and ground ice and permafrost make up nearly 1 percent. Lakes hold about 0.26 percent of Earth's freshwater. Rivers account for only 0.006 percent of Earth's freshwater and 0.0002 of its total water supply.

Continue Reading

How can you tell if an atom is a positive or negative ion?

For every electron a cation donates, it receives a positive, or 1+, charge. For every electron an anion accepts, it receives a negative, or 1-, charge. The amount of electrons an atom is willing to donate or accept can often be determined by the element’s position on the periodic table. Group 1A contains alkali metals, which donate a single electron for a 1+ charge. The alkaline earth metals in group 2A lose two electrons for a 2+ charge. Aluminum loses three electrons for a 3+ charge. The transition metals, or B family members of the periodic table, can be more difficult to determine. Many ..

Continue Reading

How many body cells does a human have?

The National Geographic article states that actually counting the number of cells in the human body is nearly impossible. This is true because it is difficult to identify particular sorts of cells, such as tangled neurons. It is also impossible because, at a rate of 10 cells a second, tens of thousands of years are required to count all the cells. As a result, estimating the number of cells is the only feasible approach.

Continue Reading

How do you dissolve copper sulfate?

Copper sulfate has been used as a herbicide, a root killer, an algaecide and a fungicide in non-agricultural and agricultural settings. It is used as a molluscicide and an antimicrobial. While excessive exposure to copper salts, including copper sulfate, is toxic, copper is an essential mineral for humans, and the general recommended dietary allowance for copper is 900 micrograms per day for adults. Copper is found in water, in foods and in the environment.

Continue Reading

What are the top 10 ways to stop global warming?

Keeping a car's tires properly inflated can increase gas mileage by more than 3 percent, keeping about 20 pounds of carbon dioxide out of the air every year, writes Larry West for About.com. Using less hot water by taking shorter showers and using cold water to wash clothes can keep up to 500 pounds of carbon monoxide, or CO2, out of the air. Avoiding products with a lot of packaging can drastically reduce the amount of garbage an individual produces, further reducing the person's carbon footprint. Adjusting the household thermostat down by 2 degrees in winter and up by 2 degrees in ..

Continue Reading

What is the pH of seawater?

Water with a pH of less than 7 is more acidic, while water with a pH of more than 7 is more alkaline, or basic. The chemical components of seawater are resistant to pH change and may remain at a more neutral level. The introduction of biological activity to the seawater and an overabundance of algae may cause the pH level of the seawater to fluctuate significantly.

Continue Reading

What is the charge of an electron?

The opposite charges of protons and electrons is what causes them to be attracted to each other. Electrons are not in the nucleus of an atom, but orbit it. There is the same number of electrons orbiting the nucleus as there are protons inside it. Electrons are the smallest part of an atom and are in constant motion. Atomic bonds are formed by either sharing or transferring electrons.

Continue Reading
Showing 6611 to 6620 of 10000 (1000 Pages)