Agriculture
Microbes at the Gas Pump
Watering the Air
Getting the dirt on carbon
Amphibians
Salamanders
Tree Frogs
Bullfrogs
Animals
Stunts for High-Diving Ants
Insects Take a Breather
Elephant Mimics
Behavior
Math Naturals
Pollution at the ends of the Earth
Pain Expectations
Birds
Carnivorous Birds
Quails
Nightingales
Chemistry and Materials
A Framework for Growing Bone
Sweeeet! The Skinny on Sugar Substitutes
A New Basketball Gets Slick
Computers
Programming with Alice
Toxic Dirt + Avian Flu = Science Fair Success
Play for Science
Dinosaurs and Fossils
Dinosaur Dig
Ancient Critter Caught Shedding Its Skin
From Mammoth to Modern Elephant
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Earth
Coral Gardens
A Volcano's Deadly Ash
Ancient Heights
Environment
A Change in Climate
Sea Otters, Kelp, and Killer Whales
Inspired by Nature
Finding the Past
Settling the Americas
Childhood's Long History
Early Maya Writing
Fish
Marlin
Eels
Halibut
Food and Nutrition
Recipe for Health
In Search of the Perfect French Fry
Chew for Health
GSAT English Rules
Whoever vs. Whomever
Problems with Prepositions
Pronouns
GSAT Exam Preparation Jamaica
Mastering The GSAT Exam
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT stars reap scholarship glory
GSAT Exams Jamaica Scholarships
42,000 students will sit for the GSAT Exam in two weeks
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
It's a Math World for Animals
Math of the World
42,000 students will sit for the GSAT Exam in two weeks
Human Body
Cell Phone Tattlers
Opening a Channel for Tasting Salt
Cell Phones and Possible Health Hazards
Invertebrates
Mussels
Flies
Bees
Mammals
Dogs
Sheep
Flying Foxes
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
Raise a Lifelong Reader by Reading Aloud
Children and Media
Physics
The Mirror Universe of Antimatter
Speedy stars
Road Bumps
Plants
A Giant Flower's New Family
Flower family knows its roots
Hungry bug seeks hot meal
Reptiles
Turtles
Caimans
Sea Turtles
Space and Astronomy
Saturn's New Moons
Dark Galaxy
Planets on the Edge
Technology and Engineering
Riding Sunlight
Spinach Power for Solar Cells
Reach for the Sky
The Parts of Speech
Pronouns
What is a Noun
Countable and Uncountable Nouns
Transportation
How to Fly Like a Bat
Flying the Hyper Skies
Revving Up Green Machines
Weather
In Antarctica watch the heat (and your step)
Polar Ice Feels the Heat
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™