C925 Earth: Inside and Out
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Free C925 Earth: Inside and Out Questions
1. Which volcanic eruption type is named after the gentle, fire-fountain activity that builds cinder cones?
- Hawaiian
- Strombolian
- Vulcanian
- Plinian
Explanation
Strombolian eruptions feature moderate explosions that eject lava fragments hundreds of meters into the air, creating rhythmic fire fountains and building steep cinder cones. Named after Stromboli volcano in Italy, which has erupted almost continuously for 2,000 years, this style produces scoria and bombs but rarely large ash clouds.
2. Which mineral is used as the standard for hardness 7 on the Mohs scale?
- Quartz
- Topaz
- Corundum
- Diamond
Explanation
Quartz, composed of silicon dioxide (SiO₂), defines hardness 7 because it scratches all minerals below it and is scratched by all above it. Its conchoidal fracture, lack of cleavage, and presence in nearly every rock type make it one of the most common and useful reference minerals for field identification.
3. What is the name of the supercontinent that existed 250 million years ago?
- Gondwana
- Laurasia
- Pangaea
- Rodinia
Explanation
Pangaea was the supercontinent that assembled around 335 million years ago and began breaking apart 175 million years ago, eventually forming today’s continents. Proposed by Alfred Wegener, its existence is supported by matching coastlines, fossil distributions, and rock sequences across South America, Africa, India, Australia, and Antarctica that only align when reassembled into Pangaea.
4. Which rock type is formed by compaction and cementation of sediments?
- Igneous
- Metamorphic
- Sedimentary
- Volcanic
Explanation
Sedimentary rocks develop when loose particles such as sand, silt, clay, or organic remains accumulate in layers and undergo lithification. Compaction squeezes the sediments together under the weight of overlying material, while cementation occurs when minerals like calcite or silica precipitate from groundwater and bind the grains. Classic examples include sandstone from compacted sand grains and limestone from cemented shell fragments, preserving evidence of past environments like river deltas or ancient oceans.
5. Which surface process creates U-shaped valleys?
- River erosion
- Wind deflation
- Glacial erosion
- Mass wasting
Explanation
Glaciers carve broad, straight U-shaped valleys by grinding bedrock with embedded rocks and ice, removing entire valley sides and creating characteristic flat floors and steep walls. Yosemite Valley and fjords in Norway are classic examples left behind when glaciers retreat after the Ice Age.
6. What is the name of the global ring of volcanoes and earthquakes around the Pacific Ocean?
- Mid-ocean ridge
- Transform belt
- Ring of Fire
- Hotspot chain
Explanation
The Ring of Fire is a 40,000-kilometer horseshoe-shaped zone encircling the Pacific Plate where approximately 75% of Earth’s volcanoes and 90% of its earthquakes occur. It marks convergent boundaries where oceanic plates subduct beneath continental plates, generating intense volcanic arcs and deep trenches. Countries such as Japan, Indonesia, Chile, and the western United States lie directly on this geologically active margin.
7. Which mineral is the primary component of limestone and marble?
- Quartz
- Feldspar
- Calcite
- Olivine
Explanation
Calcite (CaCO₃) is the essential mineral in both limestone, which forms from accumulated marine shells and precipitated calcium carbonate, and marble, its metamorphic equivalent. Calcite’s perfect rhombohedral cleavage and reaction with dilute acid make it instantly recognizable and the defining mineral of all carbonate rocks.
8. What is the Mohorovičić discontinuity commonly called?
- Conrad discontinuity
- Gutenberg discontinuity
- Moho
- Lehmann discontinuity
Explanation
The Mohorovičić discontinuity, or Moho, is the sharp seismic boundary between Earth’s crust and the denser mantle beneath. Discovered in 1909 by Croatian seismologist Andrija Mohorovičić, it marks where P-wave velocities jump from about 6–7 km/s in the lower crust to over 8 km/s in the upper mantle. The Moho lies 5–10 km beneath oceans and 30–50 km beneath continents, defining the base of the tectonic plates.
9. In a coastal environment where powerful storm waves repeatedly hurl pebbles against a cliff face, polishing and faceting the bedrock into smooth, multi-sided surfaces with sharp edges, which specific type of mechanical weathering process is responsible for creating these distinctive ventifacts?
- Frost wedging
- Thermal expansion
- Abrasion
- Salt crystallization
Explanation
Abrasion by wind- or water-driven particles acts like natural sandblasting, grinding and polishing exposed rock surfaces. In deserts and along stormy shores, ventifacts develop multiple flat faces oriented toward prevailing currents, with some examples from Antarctica preserving wind directions from millions of years ago.
10. Which branch of physical science primarily studies the composition and properties of matter?
- Physics
- Astronomy
- Chemistry
- Geology
Explanation
Chemistry focuses on the building blocks of matter, including atoms, molecules, elements, and compounds, as well as their interactions through chemical reactions, bonding, and properties like acidity or reactivity. This discipline underpins understanding of everything from mineral formation in rocks to magma composition in volcanoes, distinguishing it from physics (motion and energy), astronomy (celestial bodies), and geology (Earth’s structure and processes).
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