Think about how we locate an earthquake. The energy starts at the focus, which is the point inside the Earth where the rock actually ruptures (also called the hypocenter). The point on the Earth’s surface directly above that underground point is the epicentre. In other words, the epicentre is the surface projection of the focus. The other terms describe the internal origin or aren’t used for this surface location, so epicentre is the correct label. Seismologists determine it by comparing how long different seismic waves take to reach stations and triangulating the position.

Distillation relies on differences in boiling points to separate liquids. Heat the mixture and the liquid with the lower boiling point turns into vapor. That vapor travels to a condenser, where it cools and returns to liquid, which is collected as the distillate. If the boiling points are close, a fractionating column adds many tiny vaporization-condensation cycles to improve separation. Other methods don’t use boiling and condensation to separate liquids. Filtration removes solids from liquids based on particle size, not by vaporizing components. Evaporation turns the liquid into vapor but doesn’t capture and collect a separate liquid. Centrifugation separates by density through spinning, not by changing the phase of the liquids.

Mixing crop production with the rearing of animals describes a farming system called mixed farming. This approach uses the two parts to support each other: manure from livestock acts as natural fertilizer for crops, crop residues can feed livestock, and having both enterprises spreads economic risk and provides diverse outputs. The other options don’t describe a farming system—minerals relate to nutrients, noble gas is an inert element, and mulch is a soil cover material—so they don’t capture the idea of integrating crops and livestock on one farm.

The global feature being tested is a tropical rainfall belt that tracks the Sun. The Intertropical Convergence Zone moves north and south with the seasons, following the overhead sun, and this movement brings seasonal rainfall to different regions. It forms where the northeast and southeast trade winds meet near the equator, causing air to rise and produce heavy rain. As the Sun's position shifts, the ITCZ shifts away from the equator—northward during the Northern Hemisphere summer and southward during the Southern Hemisphere summer—driving the wet and dry seasons in much of the tropics and monsoon regions. Other terms don’t describe a moving atmospheric feature: interception is rainfall captured by vegetation, lahars are volcanic mudflows, and intercropping is an agricultural practice.