About This Chapter
The Earth - Chapter Summary
This chapter outlines the theories that explain how the Earth was formed and the forces that work together to create the Earth's shape. The origins of elevation, latitude and longitude are discussed, as well as the location of the international date line and its history. The revolution and rotation of the Earth and their effects are also covered.
Your study continues with the major rock groups, the types of weathering seen on Earth and an overview of the major world geographical regions found on the map. Once you have completed this chapter, you should be able to:
- Explain how the earth was formed and how it evolves today
- Define geodesy and how it relates to stress, gravity and density
- Describe the geographic coordinate system
- Outline the history of the international date line
- Identify the factors that affect temperature, seasons and daylight on earth
- Differentiate between the three different rock groups
- Understand the three different types of weathering
- Map the major geographical world regions
Use our chapter tests and lesson quizzes before or after you review the video lessons to see how well you understand the subject. If you'd like to review just one section of a video, use the video tabs feature in the Timeline to skip directly where you'd like to go. As you read through the lessons, contact an instructor if you would like additional help.
1. Formation of the Earth: Theories
In this lesson, the theory of how the planet Earth formed will be discussed. This includes looking at how it differentiated into three layers, how it formed its atmosphere, water, and land features, and how it continues to evolve today.
2. Shape of the Earth: Density, Stress & Gravity
This lesson will seek to explain geodesy and the Earth's shape. In doing so, it will highlight the concepts of gravity, density, and stress, as well as the role they play in the field of geodesy.
3. Geographic Coordinates: Latitude, Longitude & Elevation
This lesson will seek to explain the geographic coordinate system. In doing so, it will explain latitude and longitude. It will also highlight the equator, the prime meridian, and the concept of elevation.
4. International Date Line: Definition, History & Location
There is a line on Earth that causes you to change days when you cross it. This lesson will explain what the International Date Line is, how it affects the time zones on either side, and the history of how we decided on it.
5. Effects of the Earth's Rotation & Revolution
This lesson explores the factors that influence seasons, daylight, and temperatures on our planet, including rotation and radiation. At the end, you can test your knowledge with a brief quiz.
6. Earthquakes and Volcanoes: Evidence of Earth's Inner Layers
The interior layers of the earth are not able to be observed directly, so scientists need to rely on other information to learn about it. S waves, P waves, and magma from volcanoes and earthquakes give a glimpse at the layers of the earth by providing data that can be built into a model of the earth.
7. Types of Rocks: The Three Major Rock Groups
Did you know that lava is molten rock that reaches the earth's surface? Furthermore, did you know that rocks exist in three general forms: igneous, sedimentary and metamorphic? This lesson describes these rock types and examples of each.
8. Weathering: Definition, Types, Causes & Rates
Ever wondered how erosion could create something as dramatic as the Grand Canyon? The simple answer is weathering. This lesson describes the three major types of weathering, their causes, and how weathering rates can change.
9. The World Map: Overview & Major Geographical Regions
The world is a big place, but how well do you know it? In this lesson, we're going to look at a basic overview of major world regions and see how they collectively create the world map.
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Other chapters within the NDA Exam Preparation & Study Guide course
- About the NDA Exam
- Algebra Concepts
- Advanced Algebra Concepts
- Solving Matrices & Determinants
- Trigonometry Concepts
- Geometry & Linear Equations
- Analytic Geometry
- Functions, Limits & Continuity
- Derivative Rules
- Calculations & Applications of Derivatives
- Integral Calculus
- Differential Equations & Applications
- Scalars & Vectors in Algebra
- Visualizing Statistics
- Probability Concepts in Math
- Grammar and Usage
- Improving Reading Comprehension
- Measurements in Physics
- Motion in Physics
- Basics of Work, Power & Energy
- Understanding Heat Transfer
- Sound Waves
- Light, Mirrors & Lenses
- Electric Currents & Power
- Scientific Technology, Machines & Tools
- The Atom & Structure of Elements
- Chemical Properties of Elements & Substances
- Chemical Symbols, Formulas & Reactions
- Qualities of Living Organisms
- Health Science Basics
- Solar System & Eclipses
- Achievements of Famous Scientists
- Indian History
- Overview of Major World History Events
- World Government Types
- Earth's Oceans, Atmosphere & Climate
- Regional Geography of South Asia
- Modern Day Events in India
- NDA Exam Preparation & Study Guide Flashcards