
Unit 1 Earth Science
Flashcard
•
Science
•
9th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is nuclear fusion?
Back
Nuclear fusion is a process where two light atomic nuclei combine to form a heavier nucleus, releasing energy in the process. It is the process that powers stars, including our sun.
2.
FLASHCARD QUESTION
Front
How many hydrogen atoms are needed to fuse into one helium atom?
Back
4 hydrogen atoms are required to fuse into one helium atom.
3.
FLASHCARD QUESTION
Front
What is a supernova?
Back
A supernova is a powerful and luminous explosion that occurs at the end of a star's life cycle, particularly for massive stars. It results in the ejection of the star's outer layers.
4.
FLASHCARD QUESTION
Front
What is a dependent variable?
Back
A dependent variable is the variable that is measured or observed in an experiment. It is affected by changes in the independent variable.
5.
FLASHCARD QUESTION
Front
What is an independent variable?
Back
An independent variable is the variable that is changed or controlled in an experiment to test its effects on the dependent variable.
6.
FLASHCARD QUESTION
Front
How does the sun provide energy to the Earth?
Back
The sun provides energy to the Earth through nuclear fusion, which produces light and heat.
7.
FLASHCARD QUESTION
Front
What is the role of salt concentration in plant growth experiments?
Back
Salt concentration is the independent variable that is manipulated to observe its effect on the growth of plants.
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