"Changes in Temperature throughout the Year" Changes in the Four Seasons PPT Courseware 2

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"Changes in Temperature throughout the Year" Changes in the Four Seasons PPT Courseware 2

The concept of temperature

Temperature: refers to the temperature of the atmosphere, generally expressed in ℃.

1. Observation of temperature

Tools: Thermometer

The temperature, which accurately reflects the weather conditions in a place, is measured by a thermometer placed in the shutter box of the meteorological observation instrument installed at the meteorological station.

The temperature is usually observed four times a day, usually at 8:00, 14:00, 20:00, and 2:00 Beijing time.

review:

How does the temperature change throughout the day?

The temperature is lower in the morning and evening, and higher at noon; the temperature is lowest around 6:00 in the morning and highest around 2:00 in the afternoon.

think:

Does the temperature change throughout the year?

In what ways can we feel the changes in temperature throughout the year?

knowledge gas station

While the earth rotates, it also orbits the sun, from west to east. During the Earth's revolution, the tilt angle of the Earth's axis is about 23.5 degrees, and the direction of the tilt remains unchanged. The northern end of the Earth's axis always points near the North Star. The earth's orbit is close to a perfect circle and an ellipse. It takes one year for the Earth to make one revolution.

(1) What time of day is the highest angle of the sun?

(2) When is the highest temperature in a day?

(3) When is the time of day when the shadow of an object is the shortest?

(4) What is the main difference between the four seasons of the year?

(5) Which season has the highest temperature? Is the angle of the sun hitting the earth high or low in this season? Is the object's shadow long or short at this time?

Temperature annual change curve chart

The average monthly maximum temperature for most parts of the world's landmass during the year occurs in July in the Northern Hemisphere and in January in the Southern Hemisphere. The monthly average minimum temperature occurs in January in the Northern Hemisphere and in July in the Southern Hemisphere.

In order to intuitively reflect the monthly temperature changes in a certain place, the annual temperature curve is usually drawn. The months are marked on the horizontal line at the bottom of the graph. There is a scale indicating the temperature on the left vertical line. The average temperature of each month is The dots are marked, and the lines connecting the points are the temperature change curve throughout the year.

Rule one:

High temperatures at low latitudes Low temperatures at high latitudes

Temperatures gradually decrease from low latitudes to the poles

Rule two:

In the same latitude zone, the land temperature is high in summer and the ocean temperature is low, and the opposite is true in winter.

Factors affecting temperature distribution:

latitude factor

sea ​​and land factors

terrain factors

changes in temperature

1. Diurnal changes in temperature

Diurnal variation: the highest land temperature in a day occurs around __________, and the lowest value of ______ occurs around ______.

2. Annual changes in temperature

Annual change performance: In a year, the temperature in the Northern Hemisphere is highest in ___ month on the continent and lowest in ___ month; it is highest in ___ month and lowest in ___ month on the ocean. Southern Hemisphere___.

3. Temperature distribution and influencing factors

1. Affected by latitude position: low latitude temperature ___, high latitude temperature ___.

2. Affected by the location of land and sea

At the same latitude, the temperature in summer is ___ on land and ___ on ocean;

The opposite is true in winter.

3. Affected by terrain

The temperature in the mountains ___ as the altitude increases.

Generally speaking, for every 100 meters of elevation increase, the temperature drops by about ___.

Simulation experiment

Experimental tips:

1. When the globe simulates revolution, the earth's axis always points north (the flag points north).

2. Keep the height between the lamp and the globe at the same height and illuminate the globe.

3. Point the benchmark toward the sun and observe the length of the benchmark’s shadow.

4. Observe the sunlight exposure at the North and South Poles.

Note: When the earth rotates to different positions, is the position of direct sunlight the same? How does it change?

Now what do you think is the reason for the change of seasons?

When the earth revolves around the sun, the direction of the tilt of the earth's axis remains unchanged. During the year, as the earth's revolution position changes, the position of the sun's direct point will also change regularly, and the amount of light received by various places on the earth will also change. , this kind of cold and warm is constantly alternating, thus forming the four-season phenomenon of cold and hot.

Knowledge test

1. The change of seasons is caused by the earth ( ).

A. Rotation B. Different revolution positions C. Distance from the sun

2. When the sun shines directly on the Tropic of Cancer ( ), it is summer

A. Northern hemisphere B. Southern hemisphere C. Equator

3. When the sun shines directly on the equator, ( ).

A. It’s spring in the Northern Hemisphere B. It’s spring in the Southern Hemisphere

C. Unable to judge

Gains from this lesson

1. What did you gain from the experimental exploration in this lesson? Share it with everyone

2 Do you have any other discoveries?

Expand and extend

Do you know where the sun never sets for many days?

Where else can there be the phenomenon of always being dark for many days?

1 It’s daytime for many days, what will your life be like?

2 Many days are dark, what will your life be like?

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For more information about the PPT courseware "Changes in the Four Seasons and Temperature Changes in the Year", please click on the "Changes in the Four Seasons ppt Temperature Changes in the Year" ppt tag.

"Changes in Temperature throughout the Year" Changes in Four Seasons PPT Courseware 3:

"Changes in Temperature throughout the Year" Changes in Four Seasons PPT Courseware 3 Thinking about how the temperature changes throughout the day? From morning to noon to evening, the temperature goes from low to high to low, with the highest temperature at 2 to 3 o'clock in the afternoon. Does the temperature change throughout the year? us..

"Changes in Temperature over the Year" PPT courseware on changes in the four seasons:

"Changes in Temperature throughout the Year" PPT Courseware on Changes in Four Seasons The highest value of land temperature in a day occurs around ________, and the lowest value occurs around ________. The movement of the earth. Rotation produces: Phenomenon: produces diurnal changes in temperature between day and night. Revolution produces: Present...

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Update Time: 2024-08-04

This template belongs to science courseware E-education edition sixth grade science volume 1 industry PPT template

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