Agriculture
New Gene Fights Potato Blight
Keeping Bugs Away from Food
Silk’s superpowers
Amphibians
Frogs and Toads
Salamanders
Bullfrogs
Animals
Insect Stowaways
How to Fly Like a Bat
How to Silence a Cricket
Behavior
Brainy bees know two from three
The Disappearing Newspaper
Giving Sharks Safe Homes
Birds
Pigeons
Quails
Chicken
Chemistry and Materials
The newest superheavy in town
The science of disappearing
Sticky Silky Feet
Computers
Nonstop Robot
The Shape of the Internet
New eyes to scan the skies
Dinosaurs and Fossils
Did Dinosaurs Do Handstands?
Feathered Fossils
An Ancient Feathered Biplane
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
Earth
Snowflakes and Avalanches
Digging into a Tsunami Disaster
Wave of Destruction
Environment
Power of the Wind
Watching for Wildfires in Yellowstone
A Stormy History
Finding the Past
A Plankhouse Past
Words of the Distant Past
Stone Tablet May Solve Maya Mystery
Fish
Manta Rays
Perches
Angler Fish
Food and Nutrition
Eat Out, Eat Smart
In Search of the Perfect French Fry
The mercury in that tuna
GSAT English Rules
Who vs. Whom
Order of Adjectives
Pronouns
GSAT Exam Preparation Jamaica
2014 GSAT Results for Jamaican Kids
42,000 students will sit for the GSAT Exam in two weeks
GSAT Scholarship
GSAT Exams Jamaica Scholarships
GSAT Practice Papers | GSAT Mathematics | Maths
Access denied - Disabled boy aces GSAT
GSAT Scholarship
GSAT Mathematics
Monkeys Count
A Sweet Advance in Candy Packing
10 Common Mistakes When Preparing for the GSAT Math Test
Human Body
A Sour Taste in Your Mouth
Germ Zapper
Heavy Sleep
Invertebrates
Caterpillars
Butterflies
Termites
Mammals
Blue Bear
Chipmunks
Walrus
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
Raise a Lifelong Reader by Reading Aloud
How children learn
Physics
Dreams of Floating in Space
Strange Universe: The Stuff of Darkness
Electric Backpack
Plants
Underwater Jungles
White fuzzy mold not as friendly as it looks
The algae invasion
Reptiles
Box Turtles
Anacondas
Komodo Dragons
Space and Astronomy
A Whole Lot of Nothing
Saturn's New Moons
Slip-sliding away
Technology and Engineering
Smart Windows
Musclebots Take Some Steps
Beyond Bar Codes
The Parts of Speech
Pronouns
Adjectives and Adverbs
What is a Preposition?
Transportation
How to Fly Like a Bat
Revving Up Green Machines
Seen on the Science Fair Scene
Weather
Catching Some Rays
In Antarctica watch the heat (and your step)
Weekend Weather Really Is Different
Add your Article

Ancient Heights

You probably know where all the hills are in your neighborhood. Even so, the planet hasn't always had the same lumps. In some places, Earth was even lumpier that it is now. In other places, it was smoother. Over millions of years, entire mountain ranges have come and gone. The landscape is always changing. Now, a geologist from the Field Museum in Chicago says that she has found a new way to figure out how the shape of Earth's surface has changed over time. Her strategy? Leaf peeping. A tree's leaves have tiny holes called stomata. These pores allow the leaves to take in a gas called carbon dioxide, which the tree needs in order to survive. With this fact in mind, geologist Jennifer McElwain collected leaves from living California black oak. These trees grow in a wide range of altitudes, from sea level all the way up to 2,500 meters (8,200 feet). McElwain used a microscope to count how many stomata were inside a given area of each leaf. She found that the leaves had more stomata at higher altitudes. Then, she came up with an equation that links stomata numbers and elevation. The black oak has been around for at least 24 million years. So, scientists can now count stomata on fossilized leaves to figure out how high the trees were when they lived, McElwain says. By comparing this altitude with the altitude at which the fossils were collected, the researchers can measure any changes in elevation that had occurred. The new method should be more accurate than previous methods, McElwain says. Next, she wants to come up with equations for other tree species. Someday, she says, her research may help scientists answer a major question in geology: When did the Himalayas in Asia rise?—E. Sohn

Ancient Heights
Ancient Heights








Designed and Powered by HBJamaica.com™