Geologic Time Scale With Facts And Examples: What Is It & What Is It Used For?

Geologic Time Scale

Scientists often use terms such as “Mesozoic Era” and “Jurassic Period” when referring to certain times in Earth’s history.

Both the Mesozoic Era and the Jurassic Period are stages in the geologic time scale.

The geologic time scale links particular times in Earth’s history with the layers of rock in the Earth’s crust that were formed during those times.

For example, the Jurassic Period is the name given to the time in which a certain layer of rock in the Jura Mountains of Europe was being formed.

On this page you’ll find a complete explanation of the geologic time scale, including what it is, who uses it, and why it’s important…

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The Major Rivers Of Africa: List With Maps, Pictures & Amazing Facts

Major Rivers Of Africa

The major rivers of Africa include the Nile, Congo, Niger, Zambezi and Orange. These waterways are of vital importance to a continent in which many people live in poverty and many regions are dry. Africa’s rivers bring life to otherwise infertile and barren regions, enabling people to grow crops, catch fish and transport natural resources.

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Blue Wildebeest Migration Facts – Discover The World’s Largest Land Migration

blue wildebeest migration

The annual blue wildebeest migration in East Africa is the world’s largest land migration, and one of the most famous of all natural spectacles.

During their annual circular migration, huge herds of over a million blue wildebeest travel a distance of around 1,000 miles (1,600 km) in search of fresh grazing and water.

Challenges faced by the blue wildebeest during the journey include crossing crocodile-infested rivers and the continuous threat of predation by animals such as lions, hyenas and cheetahs.

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When Did Humans First Appear On Earth?

when did humans first appear

Humans first appeared on Earth at least 315,000 years ago. This figure is based on fossil remains found in Jebel Irhoud, Morocco – the earliest-known remains of modern humans.

The exact time humans first appeared is difficult to judge because species don’t come into being overnight. Rather, they change and evolve slowly from ancestral species.

Because the first human remains date back to around 315,000 years ago, our species will therefore have appeared some time before this. DNA evidence from human chromosomes indicates that humans (scientific name: Homo sapiens) may have first appeared more than half a million years ago.

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American Crocodile Facts, Pictures & In-Depth Information

American Crocodile Facts

The American crocodile is a large crocodilian in the family Crocodylidae (the “true crocodile” family). It is found in coastal and aquatic habitats in the warmer waters of North, Central and South America, as well as on Caribbean islands. The species shares part of its range with the similarly-sized American alligator.

Like other crocodilians, the American crocodile is an ambush predator. Rather than actively pursuing its prey, it lurks under the water waiting for unsuspecting animals to come within reach of its powerful jaws.

In many parts of its range the American crocodile was once hunted almost to extinction for both its meat and its hide. The species is now protected under national and international laws. Although no longer endangered, the American crocodile is still rated as “Vulnerable” by the International Union for Conservation of Nature.

Read on for more American crocodile facts…

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