A) Rock formations B) Glacial ice C) Sandstone D) Lava tubes
A) Erosion by wind B) Melting ice and water flow C) Earthquake activity D) Volcanic activity
A) Coral reefs B) Lava flows C) Icicles and ice formations D) Sand dunes
A) Saltwater B) Glacial meltwater C) Freshwater from lakes D) Brackish water
A) Soil fertility B) Ice sheet mass balance C) Humidity in deserts D) Ocean salinity
A) Freshwater ice B) Gold veins C) Petroleum reserves D) Coal deposits
A) With underwater diving B) Only by observation from afar C) Using remote sensing and mapping D) Through manual excavation
A) They attract more wildlife B) They grow larger every year C) They may melt or collapse D) They become colder inside |