"Earth and Globe" Earth and Map PPT Courseware 6

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"Earth and Globe" Earth and Map PPT Courseware 6

1. The shape and size of the Earth

1. Shape of the Earth

Observe the picture on the right. What is the shape of the earth?

The Earth is an irregular sphere with slightly flattened poles and a slightly bulging middle.

2.The size of the earth

The average radius of the earth is 6371 kilometers

Calculate the circumference of the equator based on the mean radius of the Earth

2πR=2×3.14×6371 kilometers=40009 kilometers≈40,000 kilometers

The earth's surface area is 510 million square kilometers

Discussion: Geographical phenomena related to the shape of the earth in daily life

1. Seeing sailboats on the beach

When a sailboat is approaching, you will always see the mast first, and then the hull; when you look away from the sailboat, the hull will gradually become smaller, and the mast will finally disappear.

2. Reasons for partial lunar eclipse

When a partial lunar eclipse occurs, the Earth blocks part of the sunlight, causing the Earth's shadow to be cast on the moon. This is how we see the Earth as a spherical model.

Think about it: How else can you prove that the Earth is spherical?

1. Stand high and see far

2. Magellan’s route

3. The most scientific proof - photos of the earth taken by artificial satellites

Humanity has gone through a long process of understanding the shape of the earth. What have you learned from it?

2. Model of the Earth - Globe

The globe is a tool for people to understand the world

3. Latitude and longitude

Earth's axis Earth's axis of rotation

North Pole The intersection of the northern section of the Earth's axis and the Earth's edge

Lines of latitude A circle that is perpendicular to the Earth's axis and goes around the Earth. The equator is the largest circle of latitude.

Antarctica The point where the southern segment of the Earth's axis intersects the Earth's surface

Meridian A semicircle connecting the North and South Poles and intersecting the parallels at right angles

1. Parallels of latitude are circles perpendicular to the earth’s axis and encircling the earth.

(1) Shape of latitude: circular

(2) Whether the latitude lines are of equal length or not of equal length?

(3) The direction pointed by the latitude line: east-west direction

The equator is the largest circle of latitude

2. Meridians are semicircles that connect the North and South Poles and intersect perpendicularly with latitudes.

(1) Shape of meridian: semicircle

(2) Whether the meridians are of equal length?

(3) The direction indicated by the longitude: north and south

longitude

00 longitude: Internationally stipulated, the longitude passing through the original site of the Greenwich Observatory in London, England, is also called the prime meridian. (The originally artificially specified 0° longitude)

Prime meridian ground mark: Greenwich Observatory, UK, mark of 0° longitude.

Equator Monument: 24km north of the center of Quito, the capital of Ecuador, South America.

1: Fill in the blanks by looking at the pictures:

1. Please judge the hemispheric position and latitude position of China: it is located in the ____ hemisphere (east, west), it is located in the ____.____ hemisphere (south, north); it is located at ____ latitude____ (high, middle, low ). Most areas are in ________ (five belts)

2. China spans approximately ____ (longitude), and the difference between its easternmost and westernmost points is ________ hours.

2: Basic fill-in-the-blank exercises

1. From the photos of the earth taken by artificial satellites, we see that the earth is a _____, but the earth is actually an irregular sphere with __________ at the poles.

2. On the globe, the line connecting the north and south __________ poles is called the __________ line, also called ___.

3. To the east of the 1800 meridian is the __________ meridian, and to the west is the _____ meridian.

4. In order to distinguish each meridian, people labeled the meridian _____. Internationally, the meridian passing through the former site of the Greenwich Observatory in the United Kingdom is designated as the longitude of __________ degrees, also called the _____ line.

5. It is customary to divide the earth into two hemispheres, the east and west, using the meridian coils composed of _____ and ____.

6. On the globe, the circles surrounding the globe along the _____ direction are called latitudes.

Comment

1. What do you think you have learned through today’s study?

2. Do you think your performance in class is good? If it is good, how do you plan to carry it forward in the future? If it's not good, how will you improve it?

3. Who do you think performed best in today’s class and why?

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For more information about the "Earth and Map Earth and Globe" PPT courseware, please click the Earth and Map ppt Earth and Globe ppt tag.

"Earth and Globe" Earth and Map PPT Courseware 7:

"Earth and Globe" Earth and Map PPT Courseware 7 The Shape of the Earth Humanity's exploration of the shape of the Earth continues the process of understanding the shape of the Earth for thousands of years. In the fifth and sixth centuries BC, ancient Greek philosophers started from the concept of the perfect sphere and believed that The earth is spherical. ..

"Earth and Globe" Earth and Map PPT Courseware 5:

"Earth and Globe" Earth and Map PPT Courseware 5 Understand the shape and size of the Earth. The sky is round, the place is like a bamboo hat, and the earth is like a disk. Satellite photos of the earth. Magellan's circumnavigation route map. The size of the earth. The average radius is 6371 kilometers. The maximum circumference is about 40,000 kilometers. Rice earth...

"Earth and Globe" Earth and Map PPT Courseware 4:

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Update Time: 2024-11-22

This template belongs to Geography courseware People's Education Edition Geography for Grade 7 Volume 1 industry PPT template

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