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It is natural for floods to occur regularly; in fact, flooding helps encourage a healthy ecosystem
on the floodplains. - answer✔True
In nature, what usually follows the process of weathering? - answer✔erosion
There are billions of years separating when scientists believe the first single-celled life forms
existed and then, much later, when the first multicellular organisms came into existence on
Earth. - answer✔true
Data have been compiled based on close analyses of fossils and rock strata. The data have been
used to better understand parts of Earth's history, including the evolution of life. - answer✔true
The four terrestrial planets are: - answer✔Mercury, Venus, Earth, and Mars
The four gas giants are: - answer✔Jupiter, Saturn, Uranus, and Neptune
How old do scientists suspect the universe is? - answer✔14 billion years old
What does the Solar Nebula Hypothesis propose? - answer✔The Sun and planets formed at the
same time from the collapse of a planetary nebula
The most common gases in our solar system are hydrogen, helium, and oxygen. - answer✔false
Which of the following gases did not accumulate in a thin atmospheric layer around the
terrestrial planets when they first formed? - answer✔Nitrous oxide
What is the largest planet in our solar system? - answer✔Jupiter
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