What are the oldest, most highly-cratered regions on the Moon called?

What are the oldest, most highly-cratered regions on the Moon called?

• A. Maria
• B. Craters
• C. Rilles
• D. Highlands

Answer: (D)

The oldest, most heavily cratered regions on the Moon are the highlands. These light, rugged areas form the Moon’s original crust and carry a dense record of impact events from the early history of the solar system, so they accumulate many craters over time and retain their rough, mountainous terrain. In contrast, the dark mare are smooth plains created when large basins were flooded by basalt lava later on, which resurfaced and buried many older craters, making those regions younger and less densely cratered. Rilles are long channels carved by volcanic or tectonic processes, and craters are individual impact features, not broad regions, so they don’t describe the aged, crater-rich terrain like the highlands do.

The oldest, most heavily cratered regions on the Moon are the highlands. These light, rugged areas form the Moon’s original crust and carry a dense record of impact events from the early history of the solar system, so they accumulate many craters over time and retain their rough, mountainous terrain. In contrast, the dark mare are smooth plains created when large basins were flooded by basalt lava later on, which resurfaced and buried many older craters, making those regions younger and less densely cratered. Rilles are long channels carved by volcanic or tectonic processes, and craters are individual impact features, not broad regions, so they don’t describe the aged, crater-rich terrain like the highlands do.