23) why does the earth have seasons? a) the earth is farther from the sun during part of the year b) the earth rotates on its axis c) each hemisphere tilts towards the sun part of the year and away from the sun for part of the year. 24) ozone in the atmosphere protects us from harmful ultraviolet rays from the sun. where is the ozone belt located? 25) twice a year, the days are approximately 12 hours long at the spring and fall a) solstice b) equinox 26) which part of earth protects us from solar emissions, and also makes the aurora borealis? 27) a system in nature that is not fully contained is call a(n) a) open system b) closed system 28) a feedback that promotes change is a a) negative feedback b) positive feedback 29) places in a system where resources gather are called: a) sinks b) feedbacks

23. b

25. b

27. b

28. b

29. a

Explanation:

23. The earth have seasons because our Earth orbits around the sun with the Earth's axis of rotation being tilted at an angle of to the plane of the orbit.

24. Ozone in the protect us against the harmful ultraviolet rays coming from the sun.

The ozone layer is found to be located at the Stratosphere's lower part where the variation in its thickness depends on the seasons and the  geography.

25. This phenomena is termed as equinox where at this time period, the Sun is Directly over the equator.

26.  The part of the earth that provides us the protection against emissions from the sun is 'atmosphere' and it also creates  the Aurora Borealis which is formed as a result of the interaction of the charged particles resulting from a storm of proton with the atmosphere giving rise to the aurora.

27. In a closed system, any waste items delivered by one animal types must be utilized by at different species.

28. Positive feedback promotes change as in this the underlying impact is improved or enhanced.

29. Sinks are those locations in a system where resources are collected..

ń, wǒ shuō yīngyǔ, dàn wǒ huì shuō qítā yǔyán, rú xībānyá yǔ fǎyǔ yìdàlì yǔ hé pǔtōnghuà, suǒyǐ bùyào pànduàn, dànshì