Q:

When did dinosaurs roam the earth?

A:

Quick Answer

Dinosaurs first walked the earth 230 million years ago and dominated the land for 160 million years. They became extinct 65 million years ago during the Cretaceous period.

Know More
When did dinosaurs roam the earth?
Credit: Andrew Bret Wallis The Image Bank Getty Images

Full Answer

The three ages of the dinosaurs include the Triassic, Jurassic and Cretaceous. These periods fall under the Mesozoic Era, which lasted from 250 to 65 million years ago. Dinosaurs evolved from lizards known as archosaurs, having developed quadrupedal or bipedal posturing. It's believed that reptiles began exhibiting dinosaur and archosaur traits during the middle of the Triassic. Early dinosaurs can be categorized as therapods, bird-hipped dinosaurs and herbivores, among other categories. Therapods evolved into tyrannosaurs, Allosaurus, dino-birds and raptors. Herbivore dinosaurs existed in greater numbers than therapods. Bird-hipped dinosaurs included ornithopods and ankylosaurs.

Learn more about Prehistory

Related Questions

  • Q:

    What was the first animal on Earth?

    A:

    As of 2015, scientists believe the first animal on Earth was the comb jelly of the phylum Ctenophora. It is an ocean-dwelling, gelatinous organism whose length varies from less than half an inch to 16 inches. Until 2008, sponges of the phylum Porifera were considered the first animal.

    Full Answer >
    Filed Under:
  • Q:

    When did the first land animals appear on Earth?

    A:

    According to Earth System Science Education, the first land animals appeared toward the middle of the Paleozoic Era, in the late Silurian period. The earliest animals to adapt to the land were small arthropods similar to mites, spiders and scorpions.

    Full Answer >
    Filed Under:
  • Q:

    What covers 2/3 of the land on Earth?

    A:

    Water covers 2/3 of the land on Earth. Roughly 71 percent of the Earth's total surface area is water, though it is always in flux due to changes in weather and climate patterns.

    Full Answer >
    Filed Under:
  • Q:

    How do tsunamis affect the Earth?

    A:

    Tsunamis affect the Earth in several ways: on land, they cause habitat disruption, flooding and alter landscapes, and produce deadly, dangerous rip currents at sea. The extent of damage tsunamis cause varies depending on the storm size and location of landfall. Tsunamis potentially cause vast flooding in low-lying land areas, and alter natural waterways, changing the shape and flow of rivers and streams.

    Full Answer >
    Filed Under:

Explore