DINOSAUR EXCTINCTION

What speed was the asteroid traveling?

• 5 to 10 kilometers/s

• 10–30 km/s

• 30-40 km/s

What happened soon after the impact?

• Burning heat, falling debris, Acid rain, shock wave

• heat blast, small earthquakes, tsunami

• shockwave, low temperature

How strong was the resulting tsunami?

• Comparable to modern tsunamis

• About 30,000× more powerful than today’s

• Only a few meters high

Are you enjoying the video lesson?

• Yes

• No

Which condition described the “nuclear winter”?

• Extreme heat from the sun

• Sunlight blocked, Earth became cold and dark

• Constant volcanic eruptions

Soon after the extinction event, which plants reappeared first?

• ferns

• flowering trees

• conifers

Earth is still facing some serious problems, such as pollution and deforestation. We need to protect it so that animals and plants won't go exctinct.

• True

• False

A massive asteroid hit Earth ........................million years ago.

• 64

• 65

• 66

Catastrophic effects included massive fires, a mega tsunami,, ........

• acid rain, a "
  nuclear winter", and mass extinction

• acid rain, small earthquake

• only dinosaur extinction

Recovery began quickly for small mammals and ferns, eventually leading to the rise of ....

• non-flowering plants and fish

• amphibians and reptiles

• mammals, birds and flowering plants