Question: It becomes cold enough for heavy clothing in December in the northern hemisphere because
Choices:
text: our planet's axis is tilted
label: A
text: Mercury's axis is tilted
label: B
text: the gravitational pull of Pluto on the southern hemisphere
label: C
text: lyrics about winter by popular musicians always mention bundling up
label: D
Answer: A
Fact: Earth 's tilt on its axis causes seasons to occur