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Earth Geography Homework Assignment

Question 17

How many galaxies are there?   While estimates among different experts vary, an acceptable range is between _________________ galaxies.  Some astrophysicists calculate that two trillion galaxies should exist within our observable Universe, but there is no direct evidence for that yet.

1. 100 million to 200 million

1. 100 thousand to 200 thousand

No answer text provided.

1. 100 billion to 200 billion

Question 18

The concept that may explain how our Sun and the planets revolving around it originated and evolved is called the

1. none of the above

1. Solar system model

1. the Nebular hypothesis

1. Big Bang model  Earth Geography Homework Assignment Help
   

Question 19  

It is the earth’s relationship to the sun, and the amount of light it receives, that is responsible for the

1. different climate types around the planet

1. biodiversity

1. a and b

1. the seasons

1. all the previous

Question 20

You and I live in the

No answer text provided.

1. Tropics

1. Polar regions

1. Midlatitudes

Question 21

The best hypotheses are logical and can be readily tested by experiment or by more observations.  Continued observations over time will either confirm that a hypothesis is accurate or reveal that is is not quite right and needs to be either further refined or rejected.  New information sometimes becomes available with the development of increasingly sophisticated technology and may lead to minor or major changes in existing hypotheses. Earth Geography Homework Assignment Help

True

False

Question 22  

In science, a theory is not just an opinion or a guess; it is a well-supported explanation of a natural phenomenon.  A theory, therefore, is the same as a hypothesis.

True

False

Question 23  

Because of Earth’s unique distance from the Sun, the planet is able to contain water in all of its forms: liquid, ice, and gas. (hint:  think of what would happen to water in Venus and Mars).

True

False

Earth Geography Homework Assignment Help

Question 24

According to current evidence, the Earth is about 4.5 billion years old, and life here began around 3.8 billion years.  It’s possible that future new evidence may show that life on Earth began even earlier.

True

False

Question 25  

Planet Earth is unique because it is within the only known solar system in our galaxy.

True

False

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