Gr 8 Natural Sciences Ch 4.1: Earth's position in the solar system

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Questions and Answers

What is the average distance between the Earth and the Sun?

  • 250 million kilometers
  • 200 million kilometers
  • 100 million kilometers
  • 150 million kilometers (correct)

What is the primary purpose of maintaining moderate temperatures on Earth?

  • To generate strong winds
  • To create a habitat for dinosaurs
  • To maintain liquid water, essential for life (correct)
  • To support the formation of mountains

What is the primary reason Earth is able to support life?

  • Its average temperature is 15°C
  • Its unique position in the habitable zone (correct)
  • Its proximity to the Sun
  • Its atmosphere is rich in oxygen

Which gas is required for respiration by most living organisms?

<p>Oxygen (B)</p> Signup and view all the answers

What is the main consequence of human activities such as burning fossil fuels and deforestation?

<p>An increase in the concentration of greenhouse gases (A)</p> Signup and view all the answers

What is the process by which plants produce food?

<p>Photosynthesis (D)</p> Signup and view all the answers

What is the range of distances from the Sun where liquid water can exist on a planet's surface?

<p>0.8 to 1.4 AU (B)</p> Signup and view all the answers

What is the term used to describe the process of simple bacteria producing oxygen through photosynthesis?

<p>Photosynthesis (D)</p> Signup and view all the answers

What is the estimated time when life on Earth began?

<p>3.5 billion years ago (C)</p> Signup and view all the answers

Why is Venus unable to support life?

<p>It is too close to the Sun (A)</p> Signup and view all the answers

What is essential for the process of photosynthesis?

<p>Sunlight (A)</p> Signup and view all the answers

What is the result of an unchecked greenhouse effect on a planet, as seen in Venus?

<p>An extreme increase in temperature (D)</p> Signup and view all the answers

What is the primary difference between Earth's atmosphere and Mars' atmosphere?

<p>Earth's atmosphere is mostly oxygen, while Mars' is mostly carbon dioxide (D)</p> Signup and view all the answers

What is the average temperature of Mars?

<p>-63°C (A)</p> Signup and view all the answers

What is the primary reason Earth is located in the habitable zone of the solar system?

<p>It has liquid water on its surface. (A)</p> Signup and view all the answers

What is the main difference between Earth's atmosphere and Venus' atmosphere?

<p>Earth's atmosphere has a balanced greenhouse effect, while Venus' has a strong greenhouse effect. (C)</p> Signup and view all the answers

What is the significance of Earth being at a distance of 1 AU from the Sun?

<p>It allows for liquid water to exist on the surface. (B)</p> Signup and view all the answers

What is the primary requirement for photosynthesis to occur?

<p>Sunlight. (A)</p> Signup and view all the answers

Why is Mars unable to support life?

<p>It is too far from the Sun, resulting in freezing temperatures. (B)</p> Signup and view all the answers

What is the term used to describe the region around a star where conditions are suitable for life?

<p>Habitable zone. (D)</p> Signup and view all the answers

What is the primary consequence of a planet being too close to the Sun?

<p>Extreme heat leads to the absence of liquid water. (A)</p> Signup and view all the answers

What is the primary condition necessary for a planet to support life?

<p>The presence of liquid water on the surface. (B)</p> Signup and view all the answers

What is the main function of the greenhouse gases in Earth's atmosphere?

<p>To trap heat and keep the planet warm enough to support life (D)</p> Signup and view all the answers

What is the primary reason for the accumulation of oxygen in the oceans and atmosphere?

<p>The production of oxygen through photosynthesis by early life forms (C)</p> Signup and view all the answers

What is the term used to describe the increase in Earth's average temperature due to human activities?

<p>Global warming (A)</p> Signup and view all the answers

What is the result of a runaway greenhouse effect, as seen in Venus?

<p>A planet with extreme temperatures (C)</p> Signup and view all the answers

What is the approximate time when life on Earth is estimated to have begun?

<p>3.5 billion years ago (A)</p> Signup and view all the answers

What is the characteristic of the early life forms on Earth?

<p>They were simple and thrived in an atmosphere with almost no oxygen (B)</p> Signup and view all the answers

What is the primary role of oxygen in the context of life on Earth?

<p>To support respiration in most living organisms (A)</p> Signup and view all the answers

What is the primary cause of the increase in Earth's average temperature?

<p>The increase in the concentration of greenhouse gases (B)</p> Signup and view all the answers

What is the significance of the example of Venus in the context of the greenhouse effect?

<p>It demonstrates the effects of an unchecked greenhouse effect (D)</p> Signup and view all the answers

What is the primary requirement for the existence of liquid water on a planet?

<p>Moderate temperatures (A)</p> Signup and view all the answers

What is the primary role of early life forms on Earth?

<p>To produce oxygen through photosynthesis (B)</p> Signup and view all the answers

What is the primary consequence of the accumulation of oxygen in the oceans and atmosphere?

<p>The development of more complex life forms (C)</p> Signup and view all the answers

Which planet's atmosphere is primarily responsible for its extreme heat?

<p>Venus (D)</p> Signup and view all the answers

What is the approximate distance range from the Sun where liquid water can exist on a planet's surface?

<p>0.8 to 1.4 AU (D)</p> Signup and view all the answers

Which of the following planets has conditions that make it suitable for photosynthesis?

<p>Earth (B)</p> Signup and view all the answers

What is the primary reason Mars is unable to support life?

<p>Freezing temperatures (B)</p> Signup and view all the answers

Which of the following is NOT a condition necessary for a planet to support life?

<p>Extreme heat (D)</p> Signup and view all the answers

What is the result of being too close to the Sun in the habitable zone?

<p>Extreme heat (A)</p> Signup and view all the answers

Which planet has an atmosphere with a balanced greenhouse effect, allowing for moderate temperatures?

<p>Earth (C)</p> Signup and view all the answers

What is the likely outcome if the concentration of greenhouse gases in Earth's atmosphere continues to increase unchecked?

<p>A rapid increase in Earth's average temperature, leading to severe climate changes (D)</p> Signup and view all the answers

What is the primary factor that distinguishes Earth's atmosphere from those of its neighboring planets?

<p>The balanced greenhouse effect (D)</p> Signup and view all the answers

What is the likely effect of deforestation on the Earth's atmosphere?

<p>An increase in the concentration of carbon dioxide (B)</p> Signup and view all the answers

What is the primary role of early life forms on Earth?

<p>To produce oxygen through photosynthesis (C)</p> Signup and view all the answers

What is the primary consequence of the accumulation of oxygen in the oceans and atmosphere?

<p>The emergence of complex life forms (B)</p> Signup and view all the answers

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