Agriculture
Silk’s superpowers
Fast-flying fungal spores
Watering the Air
Amphibians
Newts
Tree Frogs
Poison Dart Frogs
Animals
Little Beetle, Big Horns
Revenge of the Cowbirds
Life on the Down Low
Behavior
Fear Matters
Pollution at the ends of the Earth
Mosquito duets
Birds
Mockingbirds
Peafowl
Pigeons
Chemistry and Materials
Earth from the inside out
Music of the Future
Boosting Fuel Cells
Computers
Getting in Touch with Touch
Music of the Future
Troubles with Hubble
Dinosaurs and Fossils
Middle school science adventures
Tiny Pterodactyl
Early Birds Ready to Rumble
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Earth
Riding to Earth's Core
Ancient Heights
Getting the dirt on carbon
Environment
When Fungi and Algae Marry
Island Extinctions
To Catch a Dragonfly
Finding the Past
Salt and Early Civilization
A Plankhouse Past
An Ancient Childhood
Fish
Catfish
Whale Sharks
Cleaning Up Fish Farms
Food and Nutrition
Making good, brown fat
The Color of Health
Packing Fat
GSAT English Rules
Problems with Prepositions
Pronouns
Whoever vs. Whomever
GSAT Exam Preparation Jamaica
GSAT Exam Preparation
Ministry of Education Announces 82 GSAT Scholarships for 2010
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
GSAT Exam Preparation
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Mathematics
A Sweet Advance in Candy Packing
Play for Science
Math Naturals
Human Body
A New Touch
Foul Play?
Sleeping Soundly for a Longer Life
Invertebrates
Grasshoppers
Ants
Beetles
Mammals
Platypus
Numbats
Black Bear
Parents
What Not to Say to Emerging Readers
Raise a Lifelong Reader by Reading Aloud
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
The Pressure of Scuba Diving
One ring around them all
The Particle Zoo
Plants
Seeds of the Future
Plants Travel Wind Highways
Underwater Jungles
Reptiles
Lizards
Geckos
Crocodilians
Space and Astronomy
Chaos Among the Planets
An Earthlike Planet
Super Star Cluster in the Neighborhood
Technology and Engineering
Dancing with Robots
Morphing a Wing to Save Fuel
Algae Motors
The Parts of Speech
What is a Preposition?
What is a Verb?
Countable and Uncountable Nouns
Transportation
Tinkering With the Basic Bike
Robots on a Rocky Road
Ready, unplug, drive
Weather
Warmest Year on Record
Catching Some Rays
Watering the Air
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™