Answer:
Part 1: Southern Hemisphere
Part 2: Seasons occur due to the tilt of the axis of the Earth.
Step-by-step explanation:
Earth revolves around the Sun. Its orbit is nearly circular. Seasons occur on earth due to the tilt of the axis (23.5°). Due to tilt, sometimes northern hemisphere points towards the sun and sometimes away. The hemisphere which points towards the sun experiences summer and the one away experiences winter. In December, southern hemisphere points towards the sun and hence has summers and winters in June.