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