Earth's southern hemisphere generally experiences colder temperatures in July than it does in January. Which statement explains why?
O A. The southern hemisphere is tilted away from the Sun in January.
O B. Sunlight strikes the southern hemisphere at a more direct angle in
July.
O C. The Sun produces more energy in June, July, and August than it
does in December, January, and February.
D. Sunlight in the southern hemisphere is more spread out in July.

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Most elements have more than one naturally occurring isotope. as you learned previously, the atoms of those isotopes have the same atomic number (number of protons), making them belong to the same element, but they have different mass numbers (total number of protons and neutrons) giving them different atomic masses. so which mass is put on the periodic table for each element? is it the most common isotope’s mass? the heaviest mass? this activity will answer that question.