Atmosphere
The atmosphere is the layer of gases that surround the Earth. It is held in place by the Earth's gravity and is composed of different gases that are crucial for supporting life on Earth.
Composition of the Atmosphere
The Earth's atmosphere is composed mainly of nitrogen (78%) and oxygen (21%). The remaining 1% consists of trace gases such as carbon dioxide, argon, and water vapor.
Layers of the Atmosphere
The atmosphere is divided into several layers based on temperature changes with increasing altitude: troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
Functions of the Atmosphere
- Protection: The atmosphere protects the Earth from the harmful effects of solar radiation and meteoroids.
- Temperature regulation: It helps regulate the Earth's temperature by trapping heat from the Sun.
- Supporting life: The atmosphere provides the gases necessary for respiration and photosynthesis, crucial for the survival of living organisms.
Effects of Human Activities on the Atmosphere
Human activities, such as burning fossil fuels and deforestation, have led to an increase in greenhouse gases like carbon dioxide, contributing to global warming and climate change.
Study Tips
- Understand the composition and layers of the atmosphere.
- Learn about the functions of the atmosphere and how human activities impact it.
- Practice identifying the different gases found in the atmosphere.
- Use diagrams and visuals to understand the layers of the atmosphere.
[Atmosphere] Related Worksheets and Study Guides:
.◂Science Worksheets and Study Guides Seventh Grade. Ecosystems, food chains and food webs
Study Guide
Ecosystems, food chains and food webs 
Activity Lesson
Ecosystems, Food Chains & Food Webs Worksheet/Answer key
Ecosystems, food chains and food webs Worksheet/Answer key
Ecosystems, food chains and food webs Worksheet/Answer key
Ecosystems, food chains and food webs Vocabulary/Answer key
Ecosystems, food chains and food webs Vocabulary/Answer key
Ecosystems, food chains and food webs Vocabulary/Answer key
Ecosystems, food chains and food webs Vocabulary/Answer key
Ecosystems, food chains and food webs Vocabulary/Answer key
Ecosystems, food chains and food webs
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE
Ecosystems: Interactions, Energy, and Dynamics
Examine the cycling of matter between abiotic and biotic parts of ecosystems to explain the flow of energy and the conservation of matter.
Analyze and interpret data to provide evidence regarding how resource availability impacts individual organisms as well as populations of organisms within an ecosystem.
Construct an explanation to predict patterns of interactions in different ecosystems in terms of the relationships between and among organisms (e.g., competition, predation, mutualism, commensalism, parasitism).
Engage in argument to defend the effectiveness of a design solution that maintains biodiversity and ecosystem services (e.g., using scientific, economic, and social considerations regarding purifying water, recycling nutrients, preventing soil erosion).