Earth's Systems: Water and Weather — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Antarctic ice melts, adding fresh water to salty oceans. Which sphere interaction does this most clearly show?
A) Cryosphere meltwater changes the hydrosphere's salinity
B) Atmosphere directly creates new geosphere mountains
C) Biosphere consumes all of the cryosphere quickly
D) Sun absorbs ocean water back into space directly
Cryosphere ice melts into the hydrosphere, diluting ocean salinity and potentially altering currents that regulate global climate patterns over time.
2. A 2-degree temperature rise affects global weather patterns. What is one likely outcome scientists predict?
A) Hurricanes become weaker and less frequent worldwide
B) More extreme storms and longer droughts occur
C) All deserts will turn into rainforests immediately
D) Snow will fall in tropical regions year-round
Warmer air carries more water vapor, intensifying storms and droughts simultaneously by shifting rainfall patterns unpredictably across continents and ocean regions.
3. Bangladesh floods damage farms and homes. Which sphere is most clearly affected when crops are destroyed?
A) Only the geosphere is affected slightly
B) Atmosphere alone changes during the floods
C) Biosphere suffers as plants and people lose food
D) Cryosphere expands during heavy floods
Biosphere includes all living organisms, so destroyed crops mean plants die and humans lose vital food sources, causing widespread hunger.
4. A drought reduces a watershed's water flow. Which prediction makes the most sense based on the water cycle?
A) Tributaries swell with extra water suddenly
B) Aquifers automatically refill themselves underground
C) Ocean levels rise dramatically from drought
D) Less water reaches rivers and groundwater stores
With less rain entering watersheds, tributaries shrink, aquifers receive less recharge, and rivers carry reduced volumes toward oceans and ecosystems steadily.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Warmer air holds more moisture, leading to stronger rainfall during storms.
Increased atmospheric water vapor intensifies precipitation when air cools, producing heavier rainfall events that overwhelm drainage systems and ecosystems alike.
2. Melting glaciers add fresh water that lowers ocean salinity over time.
Freshwater meltwater dilutes seawater, reducing salinity and potentially weakening ocean currents that distribute heat around Earth's climate system globally.
3. If a watershed loses tree cover, more water runs off as runoff instead of soaking in.
Deforestation reduces infiltration, increasing surface runoff that erodes soil, floods rivers, and prevents groundwater recharge in aquifers below ground.
4. Rising sea levels combined with stronger storms produce dangerous storm surges along coasts.
Storm surges occur when hurricane winds drive ocean water onto land, with higher sea levels making surges reach further inland and cause damage.
5. Scientists use temperature trends to predict future climate patterns across the globe.
Climate projections rely on temperature, precipitation, and circulation models to forecast how regions will warm, dry, or wet in upcoming decades.