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