RECALL

When did the universe begin?

• 4.6 billion years ago

• 14 million years ago

• 4.6 million years ago

• 14 billion years ago

Answer explanation

13.8 billion years ago (approximately 14 billion years ago) when the universe began as a tiny, dense, fireball that exploded

What was the name of the explosion that created the universe?

• Bang Bang

• Big Bang

• She bangs

• Big Bong

Answer explanation

The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!

What is the earth's age?

• 4.6 million years old

• 4.6 billion years old

• 6.4 billion years old

• 6.4 million years old

Answer explanation

Today, we know from radiometric dating that Earth is about 4.543 (or 4.6) billion years old.

Do you believe that when earth was formed, evidence of life already exists?

• Yes

• No

Answer explanation

No, because the atmosphere on Earth was toxic at first.

What caused the water to vaporize considering the fact that the earth was toxic before?

• High temperature

• High chemical shift

• High five

• High toxicity

Answer explanation

Due to the toxic Earth's high temperature (88 degrees Celsius), water vaporizes for a million years or so.

What gas did not exist during the early Earth's history?

• Nitrogen

• Oxygen

• Carbon

Answer explanation

The early Earth didn't have any oxygen. Furthermore the explanation as to why research concluded that life was not present at the time.

What caused the early Earth to become slightly cooler?

• Water Vaporization

• Condensation

• Precipitation

• All of the above

Answer explanation

Due of the high warmth, the water evaporates (heat)

The vaporized water was transformed into liquid and remains on the cloud. (Condensation)

And when the cloud can no longer contain liquid, it will start to pour (Precipitation)

Long periods of rain caused the early Earth to cool and give rise to the oceans.