Dynamic Planet Practice Tests
Free, AI-generated Dynamic Planet practice tests for Science Olympiad. Choose Invitational, Regional, State, or National difficulty, import past exam PDFs, and track your scores over time.
Dynamic Planet runs in both Division B and Division C for the 2027 season. 2027 rules focus: Earth's Fresh Waters.
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Dynamic Planet Sample Practice Questions
1. The largest reservoir of Earth’s water is:
- Glaciers and ice caps
- Groundwater
- The oceans
- Lakes and rivers
Show answer and explanation
Answer: The oceans
Oceans hold about 97% of Earth’s water. Glaciers hold most of the remaining fresh water (~2%), and groundwater is the largest liquid freshwater store available to people.
2. The water table is defined as the:
- Bottom of the saturated zone
- Top of the saturated zone
- Depth where wells stop producing
- Boundary between fresh and salt water
Show answer and explanation
Answer: Top of the saturated zone
Below the water table, pore spaces are completely filled with water (saturated zone); above it, pores hold air and water (unsaturated zone). The table rises and falls with recharge and pumping.
3. Karst topography - caves, sinkholes, and disappearing streams - forms mainly by:
- Glacial scouring
- Dissolution of limestone by acidic water
- Wind erosion of sandstone
- Volcanic collapse
Show answer and explanation
Answer: Dissolution of limestone by acidic water
Slightly acidic groundwater (carbonic acid from CO₂ dissolved in rain) dissolves carbonate rocks like limestone along joints, enlarging them into caves and eventually collapsing surface depressions.
4. A stream’s "competence" refers to:
- Total sediment load carried
- Largest particle size it can move
- Dissolved load only
- Speed of the water
Show answer and explanation
Answer: Largest particle size it can move
Competence is the biggest particle a stream can transport (it rises steeply with velocity); capacity is the total load it carries. Confusing the two is a classic exam trap.
5. An artesian well flows without pumping because the aquifer is:
- Unconfined and shallow
- Confined and under pressure
- Fully depleted
- Frozen year-round
Show answer and explanation
Answer: Confined and under pressure
Water in a confined aquifer between impermeable layers is pressurized by recharge at higher elevation; a well puncturing the layer lets water rise - and sometimes flow - on its own.
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What Dynamic Planet Tests Cover
plate tectonics, earthquakes, volcanoes, rock cycle, weathering, erosion, and Earth structure.
Earth's structure
- Crust: Thin outer layer (5-70 km)
- Oceanic crust: Thinner (~7 km), denser (basalt), younger
- Continental crust: Thicker (~35 km), less dense (granite), older
- Mantle: 2,900 km thick, solid but flows slowly (convection)
- Lithosphere: Rigid upper mantle + crust (~100 km)
- Asthenosphere: Partially molten, plates float on this
- Outer Core: Liquid iron/nickel, 2,200 km thick, generates magnetic field
- Inner Core: Solid iron/nickel, ~1,200 km radius, hottest part (~5,400°C)
- How we know: Seismic waves (S-waves can't go through liquid outer core)
Plate tectonics
- Plates float on asthenosphere, driven by mantle convection
- Divergent boundaries: Plates move apart
- Mid-ocean ridges (new seafloor), Rift valleys (East Africa)
- Seafloor spreading: Youngest rock at ridge, older away
- Convergent boundaries: Plates collide
- Ocean-ocean: Subduction, volcanic island arc (Japan)
- Ocean-continent: Subduction, coastal volcanoes (Andes)
- Continent-continent: Mountains, no subduction (Himalayas)
- Transform boundaries: Plates slide past
- Earthquakes, no volcanoes (San Andreas Fault)
- Hot spots: Stationary magma plumes, chains of volcanoes (Hawaii)
- Evidence for plate tectonics:
- Continental fit (Africa + South America)
- Fossil distribution (same fossils on separated continents)
- Magnetic striping (symmetric pattern at mid-ocean ridges)
- Earthquake/volcano distribution (along plate boundaries)
Earthquakes
- Focus: Point where rupture begins (underground)
- Epicenter: Point on surface directly above focus
- Seismic waves:
- P-waves (Primary): Fastest, compressional (push-pull), travel through solids AND liquids
- S-waves (Secondary): Slower, shear (side-to-side), only through solids (NOT liquids)
- Surface waves (Love, Rayleigh): Slowest, most destructive, travel along surface
- Magnitude scales:
- Richter: Logarithmic! Each whole number = 10× amplitude, ~32× energy
- Moment magnitude: More accurate for large quakes
- Intensity: Mercalli scale (I-XII), measures damage/felt effects
- Seismograph: Records seismic waves, uses P-S time difference to locate epicenter
- Locating epicenter: Need 3+ seismograph stations, triangulation
Volcanoes
- Magma: Molten rock underground. Lava: Molten rock at surface
- Magma types:
- Basaltic: Low silica, low viscosity, flows easily, less explosive
- Andesitic: Medium silica, medium viscosity
- Rhyolitic: High silica, high viscosity, very explosive
- Volcano types:
- Shield: Gentle slopes, basaltic, effusive eruptions (Hawaii, Mars)
- Stratovolcano (composite): Steep, alternating lava/ash, explosive (Mt. St. Helens, Fuji)
- Cinder cone: Smallest, steep, pyroclastic material
- Caldera: Large crater from collapse after massive eruption (Yellowstone)
- Volcanic hazards: Lava flows, Pyroclastic flows, Lahars (mudflows), Ash fall, Gases
Weathering & erosion
- Weathering: Breaking down rock in place
- Mechanical/Physical: Frost wedging, Root growth, Thermal expansion, Abrasion
- Chemical: Dissolution, Oxidation (rust), Hydrolysis, Acid rain
- Erosion: Transport of weathered material by water, wind, ice, gravity
- Deposition: Material settles out when energy decreases
- Mass wasting: Gravity-driven movement (landslides, rockfalls, creep)
- Stream features: V-shaped valleys, Meanders, Oxbow lakes, Deltas, Alluvial fans
- Glacial features: U-shaped valleys, Moraines, Cirques, Drumlins, Erratics
Rock cycle
- Igneous → (weathering/erosion) → Sediments → (compaction/cementation) → Sedimentary
- Sedimentary → (heat/pressure) → Metamorphic
- Any rock → (melting) → Magma → (cooling) → Igneous
- Any rock can become any other type through the right processes
Common mistakes
- Confusing P-waves (through liquids) and S-waves (NOT through liquids)
- Forgetting Richter scale is logarithmic
- Mixing up magma (underground) and lava (surface)
- Confusing weathering (in place) and erosion (transport)