Science

Refine Search

What are weeping evergreens?

An example of a weeping evergreen is the weeping blue Atlas cedar. It is a conifer with branches that twist and spread wide over the ground. Although the trunk can grow as tall as 20 feet, its branches droop downward as they grow. Most trees are 10 feet tall and 20 feet wide.\nNot all evergreens are conifers; the peppermint tree of Australia is an example of a weeping evergreen that has broad, flat leaves rather than coniferous needles. Like the weeping cedar, its branches droop dramatically and provide a good source of shade.

Continue Reading

What are the human neck bones?

The seven cervical vertebrae are the smallest backbones in the human body, and the vertebra closest to the skull is the smallest of the seven neck bones. Each cervical vertebra has a cervical disc between it, and these bones support the head. Muscles attached to these vertebrae rotate, flex and extend the neck, notes Spine-health.com. The atlas and axis are specialized vertebrae that help rotate the head side-to-side, whereas the other five cervical vertebrae more closely resemble larger vertebrae further down the spine.\nThe seven cervical vertebrae protect the spinal cord as it protrudes fro..

Continue Reading

What are chromosomes composed of?

The four base chemicals are adenine, cytosine, thymine and guanine. Uracil is another base chemical, but it is only present in RNA. Adenine and guanine both have two nitrogen rings and are called purines. Cytosine, thymine and uracil only have one nitrogen ring and are called pyrimidines.\nThese base chemicals bind together, adenine to thymine and cytosine to guanine, to create a strand of DNA about 6 feet long. The bound chemicals take the shape of a helix, which looks like a twisted ladder.\nThe DNA strand then wraps itself around protein molecules called histones. When wrapped up together, ..

Continue Reading

How long is an eon?

In ancient Greece, the word "aion" meant an infinitely long time or an eternity. Plato used the word to denote the eternal ideas that lay behind the perceived world. Geologists divide the history of the Earth into four geologic eons. The latest, called the Phanerozoic Eon, began 540 million years ago and continues into the present day.

Continue Reading

How do you stop growing?

The onset of puberty, which is a period characterized by the achievement of fertility and sexual maturation, can vary widely from child to child. Normally girls hit puberty between the ages of 10 to 14 while boys begin puberty anywhere from 12 to 16, according to MedicineNet. Men and women reach their full heights at different ages, with most women reaching their adult heights around two years after the beginning of their first menstrual cycles. Men, on the other hand, may continue to grow up until age 20, according to HealthTap.Adolescent girls reach puberty earlier, and are reaching their ad..

Continue Reading

What is a food web creator?

Food webs differ from food chains in that while a food chain shows the linear relationships of feeding among species, a food web illustrates interconnected feeding relationships among organisms. Ecologist Charles Elton proposed the concept of a food web in 1927, which he then called the food cycle. He used it to describe the relationship between herbivores and carnivores and to explain how each group obtained its energy.

Continue Reading

What color is onyx?

Onyx is available in different sizes and shapes. It is a hard stone, which is moderately resistant to damage and measures 7.0 on Moh's hardness scale. Onyx is formed from quartz, and is the most common type of mineral in the world, accounting for 12 percent of the Earth's crust. While most regions of the world have deposits of onyx, the main regions of production are the United States, Brazil, India, Pakistan, Sri Lanka and Madagascar.

Continue Reading

How does the nitrogen cycle work?

Atmospheric nitrogen can be taken up by rain and carried to the soil as nitric acid, or HNO3. Once in the soil, bacteria and some legume-type plants fix the nitrogen. Peanuts, clover and soy exist symbiotically with microbes to use nitric acid as a fertilizer to aid their growth. A byproduct of this process is a chemical called ammonia, or NH3. Ammonia is used as a fuel by specialist bacteria that ultimately convert it into nitrate, NO3-, which the plants can then use to efficiently synthesize proteins.\nWhen plants die, their nutrients are consumed by microorganisms in the soil. The nitrate t..

Continue Reading

What is the pH of NaOH?

NaOH, commonly called lye, is used very often in cleaning products like soap and oven cleaner. With a pH of 14, NaOH is a very strong base and burns tissues on contact. In contrast, HCl, or hydrochloric acid, is an extremely acidic substance and rates a pH of 0.\nThe pH scale measures how acidic or basic a substance is. Anything with a pH higher than 7 is a base, whereas substances with a pH lower than 7 are acids. Most substances range from 0 to 14 on the pH scale.

Continue Reading

Is bleach flammable?

Bleach should be kept away from any other chemicals as a safety precaution, as it is prone to react explosively with other common materials. Other safety concerns of bleach involve damage done to the body through inhalation, skin contact and ingestion. Inhalation may cause irritation or damage to the respiratory system. It is recommended to use bleach in a well-ventilated area. Contact with skin may cause irritation and lead to chemical burns. Ingestion may damage the gastrointestinal tract. Due to these dangers, bleach should be kept away from children and animals.

Continue Reading
Showing 321 to 330 of 10000 (1000 Pages)