ScienceIQ.com

What is Volcanic Ash?

Small jagged pieces of rocks, minerals, and volcanic glass the size of sand and silt (less than 1/12 inch or 2 millimeters in diameter) erupted by a volcano are called volcanic ash. Very small ash particles can be less than 1/25,000th of an inch (0.001 millimeter) across. Though called 'ash,' volcanic ash is not the product of combustion, like the ...

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VolcanicAsh
Biology

How Do They Grow Those Colossal Pumpkins?

Those enormous pumpkins that set records every fall are living proof that both genes and environment make living things what they are. Home gardeners out to break the 2002 record for the world's ... Continue reading

ColossalPumpkins
Biology

What Gives Hair Its Color?

Put a single hair under a microscope, and you'll see granules of black, brown, yellow, or red pigment. What you are seeing are tiny particles of melanin, the same pigment that gives skin its color. ... Continue reading

WhatGivesHairItsColor
Geology

What Is The Most Damaging Hazard From A Hurricane?

The greatest potential for loss of life and property related to a hurricane is from the storm surge—water pushed ashore by the force of the winds accompanying a hurricane. Although hurricanes are ... Continue reading

Hurricane
Geology

Lightning Striking Again

What's hotter than the surface of the sun, moves with incredible speed, lasts a few seconds and goes out with a bang? If you said lightning, you're right. Lightning strikes cause thousands of forest ... Continue reading

LightningStrike

Tea Time!

TeaTimeDid you know that a disease of coffee plantations made the British tea drinkers? In the 1700s Britain had many coffeehouses that served as popular social gathering places to discuss current events and conduct business. For example, the famous insurance company 'Lloyds of London' was started by patrons of Edward Lloyd's coffeehouse about 1774. These coffeehouses obtained their coffee from plantations in Ceylon (now known as Sri Lanka), the leading coffee exporter of the time. About 1870 a serious disease, coffee rust, struck these plantations and in 10 years had destroyed half of the coffee production. As a result of this disease former coffee plantations were replanted with more than a half-billion tea bushes.

A pound of tea yields 10 times as many cups of the brew as a pound of coffee, making tea much less expensive than coffee and allowing the lower classes to enjoy a stimulating beverage. So tea became a great leveler of British society.

Although rust-resistant coffee varieties have been developed, races of rust occur that overcome this resistance, and the disease continues to be a problem. Strict quarantines are enforced in coffee growing regions of the world, especially in Central America, in an attempt to prevent the establishment of rust in their coffee plantations.