Alfred Wegener
Why did no one believe him?
He only had one piece of evidence.
How many kilometers are the Himalayan Mountains?
2,500 kilometers
What is the longest chain of mountains?
The system of mid-ocean ridges.
What continents were in Pangea?
Antarctica, South and North America, India, Australia, and Madagascar.
300 million years ago, what fossil did every continent have in common?
Early Glossopteris Flora
What was his one piece of evidence?
The continents looked like puzzle pieces.
What countries do the Himalayan mountains spread across?
Tibet, Bhutan, Nepal.
What is sonar and what did scientists use sonar for?
Sonar is a device that bounces sound waves off underwater objects and then records the echoes of the sound waves. Scientists used sonar to map the mid-ocean ridges.
What did Pangea break into?
Laurasia and Gondwanaland.
100 million years ago, what fossil proves that Australia and Antarctica were once connected?
The minmi and the austrosaurus were on both continents. They were both land animals, sho they couldn’t have swam or flown to the other continent.
What was his theory that is now known to be inaccurate?
That the Earth’s continental crust moved slowly and pushed through the oceanic crust.
How were the Himalayas created?
When India collided with Europe and Asia, the crust moved upward to create the mountains.
What do mid-ocean ridges do?
At a mid-ocean ridge, molten material rises from the mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge, which eventually moved the continents.
What continents were in Gondwanaland?
South America, Africa, Madagascar, India, Antarctica, and Australia.
What did EGF evolve into?
Later Glossopteris Flora and Dicrodium flora.
When Wegener introduced continental drift, and the idea of the continents being one, Pangea which means?
“All-Earth”
What are the Himalayas?
The Himalayas are pieces of plate broken and lifted upward.
How often is the ocean floor renewed?
Because of sea floor spreading, the ocean floor is renewed every 200 million years.
When did Pangea start to break apart?
In the Mesozoic era, about 200 million years ago.
What fossil evidence from the present day do most of the continents have in common?
They all have similar earthworm species.
What proved Alfred Wegener’s theory 30 years after he died?
Plate tectonics changed the way geologists thought.
How much are the Himalayas growing?
The Himalayan Mountains grow in elevation at about 1 centimeter per year.
What is subduction?
Subduction is the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle.
What continents were in Laurasia?
North America, Europe and Asia.
Why couldn’t EGF seeds spread?
Because the seeds were too heavy.