Causes of Climate Change: Natural Causes

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Questions and Answers

What is the primary reason why the Earth has periodic seasons?

  • Precession
  • Obliquity (correct)
  • Tidal forces from the Moon
  • Eccentricity

How does an increase in obliquity affect seasonal contrast on Earth?

  • Decreases seasonal contrast
  • Causes seasons to disappear
  • Has no effect on seasonal contrast
  • Increases seasonal contrast (correct)

What effect does eccentricity have on the variation in lengths of seasons?

  • Causes the Earth to stop rotating
  • Has no effect on the variation in lengths of seasons
  • Increases variation in lengths of seasons (correct)
  • Decreases variation in lengths of seasons

What causes the Earth to wobble slightly around its rotational axis?

<p>Tidal forces from the Sun and Moon (B)</p> Signup and view all the answers

Which orbital cycle appears to be the primary cause of past ice ages on Earth?

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

What is the main reason for variations in the intensity of sunlight reaching the surface of the Earth?

<p>Variations in solar activity (D)</p> Signup and view all the answers

Which of the following is NOT a component of the Milankovitch cycles affecting Earth's climate?

<p>Variations in solar activity (C)</p> Signup and view all the answers

What is the effect of changes in Earth's orbit around the sun on climate?

<p>Lead to cooling or warming of Earth's climate (B)</p> Signup and view all the answers

Which component of the Milankovitch cycle refers to the shape of Earth's orbit around the sun?

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

Why do seasons on Earth vary slightly in length according to the text?

<p>Eccentricity of Earth's orbit (B)</p> Signup and view all the answers

Which factor plays a minor role in climate change compared to human-induced climate change according to the text?

<p>Variations in solar activity (B)</p> Signup and view all the answers

Flashcards

Earth's Seasons reason

The Earth's tilt (obliquity) on its axis causes periodic seasons.

Increased Obliquity effect

Higher tilt leads to greater seasonal temperature variations.

Eccentricity's effect on seasons

Changes in Earth's orbit shape (eccentricity) affect the length of seasons.

Earth's wobble cause

Tidal forces from the Sun and Moon cause Earth to wobble.

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Ice Ages cause

Eccentricity changes are a significant contributor to past ice ages.

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Sun intensity variation reason

Changes in solar intensity variations are caused by solar activity.

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Milankovitch Cycles - missing component

Variations in solar activity are NOT a component of Milankovitch cycles affecting climate.

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Earth's orbital change effect

Changes in Earth's orbit (Milankovitch cycles) cause global temperature changes (cooling or warming).

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Eccentricity definition

Eccentricity describes the shape of Earth's orbit around the Sun.

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Season length variation cause

The slightly varying length of Earth's seasons is due to the eccentricity of its orbit.

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Minor climate change factor

Variations in solar activity are a minor factor compared to human-induced climate change.

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