6th Grade Science: Life on Earth

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Questions and Answers

La ______ de la Terre dans le système solaire et sa composition créent des conditions favorables à la vie.

position

La température moyenne favorable à la vie est de +_____°C.

15

Il y a présence d'_____ ______ en grande quantité.

eau liquide

L'atmosphère contient du ______.

<p>dioxygène</p> Signup and view all the answers

Une couche d'______ limitant le passage des rayons UV.

<p>ozone</p> Signup and view all the answers

La Terre s'est ______ il y a environ 4,6 milliards d'années.

<p>formée</p> Signup and view all the answers

La vie est apparue il y a environ 3,6 milliards d'années, tout d'abord sous forme de ______.

<p>bactéries</p> Signup and view all the answers

Sans ______ ______ ______, la température moyenne sur Terre devrait être de -18°C.

<p>effet de serre</p> Signup and view all the answers

Les activités ______ ont augmenté l'effet de serre provoquant un réchauffement anormal et rapide de la planète.

<p>humaines</p> Signup and view all the answers

Les principaux ______ à effet de serre sont le dioxyde de carbone et le méthane.

<p>gaz</p> Signup and view all the answers

Le réchauffement accéléré de la Terre augmente la ______ et l'______ de phénomènes météorologiques violents.

<p>fréquence, intensité</p> Signup and view all the answers

Le réchauffement accéléré de la Terre modifie les conditions de vie des humains et des espèces ______.

<p>animales</p> Signup and view all the answers

Flashcards

Earth's Life Conditions

The Earth's placement in the solar system and its makeup create conditions that allow life.

Favorable Conditions for Life

A moderate temperature around +15°C, liquid water in large quantities, an atmosphere with dioxygen, and an ozone layer.

When did Earth form?

Approximately 4.6 billion years ago.

When did life appear on Earth?

About 3.6 billion years ago, initially as bacteria.

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Cause of abnormal global warming

Human activities, such as industries and transportation, have increased the greenhouse effect, leading to abnormal warming.

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Main Greenhouse Gases

Carbon dioxide and methane.

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Effects of Accelerated Warming

Increased frequency and intensity of severe weather events like storms, cyclones and floods.

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What does accelerated warming modify?

Human and animal life conditions.

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Ozone Layer's role

It limits the passage of UV rays.

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Study Notes

  • Sciences and Technology 6th grade.
  • Theme 4: Science of Life and Earth.
  • Chapter 1: Life on Earth.

Objectives

  • Describe the conditions of life on Earth.
  • Differentiate between meteorology and climate.
  • Understand climate change.

The conditions of life on Earth.

  • Earth's position within the solar system and its composition create favorable conditions for life.
  • Average temperature of +15°C.
  • Presence of liquid water in large quantities.
  • Atmosphere containing dioxygen.
  • An ozone layer limiting the passage of UV rays.
  • Earth formed approximately 4.6 billion years ago.
  • Life appeared approximately 3.6 billion years ago, initially in the form of bacteria.

The causes of current climate change.

  • Without the natural greenhouse effect, considering the Sun's position at 150 million km, the average temperature on Earth would be -18°C.
  • Human activities (industries, transportation) have increased the greenhouse effect, causing abnormal and rapid warming of the planet.
  • The main greenhouse gasses are carbon dioxide and methane.

The consequences of current climate change.

  • Accelerated global warming increases the frequency and intensity of violent weather events.
  • Storms, cyclones and floods are some examples.
  • Climate change is modifying living conditions for humans and animal species.

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