C925 Earth: Inside and Out

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Free C925 Earth: Inside and Out Questions

1.

What does a scientific model represent in physical sciences?

  • A final proven fact

  • A simplified representation of complex phenomena

  • A random guess

  • A detailed experiment

Explanation

Scientific models are simplified tools—diagrams, equations, or simulations—that approximate real-world processes to predict outcomes and test ideas without full complexity. In earth science, the conveyor-belt model of plate tectonics visualizes subduction and ridge formation to explain continent movement, or computer models simulate mantle convection to forecast volcanic activity, allowing refinement as new data emerges.

2.

Which type of fault forms when rocks are pulled apart under tensional stress?

  • Reverse fault

  • Strike-slip fault

  • Normal fault

  • Thrust fault

Explanation

Normal faults develop in extensional regimes where the crust is stretched, causing the hanging wall to slide downward relative to the footwall along a steeply dipping plane. They dominate rift zones like the East African Rift and Basin and Range Province, creating fault-block mountains and deep grabens that fill with sediment over time.
3.

Which silicate mineral group makes up over 90% of Earth’s crust?

  • Olivine

  • Pyroxene

  • Feldspar

  • Quartz

Explanation

Feldspar is the most abundant group of minerals in Earth’s crust, comprising approximately 60% of its volume, which pushes the total silicate mineral content above 90% when combined with quartz, mica, and amphibole. Feldspars are framework silicates with a three-dimensional network of silica tetrahedra linked by aluminum, potassium, sodium, or calcium ions. They weather to form clay minerals and are essential components of igneous, metamorphic, and sedimentary rocks worldwide.
4.

Which volcano type is small, steep, and made mostly of pyroclastic fragments like scoria?

  • Shield

  • Composite

  • Cinder cone

  • Lava dome

Explanation

Cinder cones form rapidly from gas-charged lava ejected as fragments that cool in the air and pile up around the vent, creating steep slopes of loose scoria and ash. They are the simplest and smallest volcano type, rarely exceeding 300 meters in height. Paricutin in Mexico famously grew from a cornfield to a 400-meter cone in just nine years through strombolian eruptions.
5.

What is the upper surface of the zone of saturation called?

  • Capillary fringe

  • Aquiclude

  • Water table

  • Perched water

Explanation

The water table marks the exact level below which the ground is fully saturated with water and above which pores contain air. It is not flat but mimics surface topography at a muted scale—higher under hills and lower under valleys. During rainy seasons the water table rises, and in dry periods it falls; wells must be drilled beneath this level to reliably produce water.

6.

Which mineral property is tested by rubbing it against a porcelain plate?

  • Cleavage

  • Luster

  • Streak

  • Hardness

Explanation

Streak is the color of a mineral’s powder when it is scraped across an unglazed porcelain streak plate. This property is often more reliable than the mineral’s external color because weathering or impurities can alter surface appearance, but the powder color remains consistent. For example, hematite always leaves a reddish-brown streak regardless of whether it appears metallic gray or earthy red on the outside, making streak a key diagnostic tool in mineral identification.
7.

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.
8.

In a region of active continental rifting where the crust is being stretched and thinned over millions of years, creating a series of stepped fault blocks that form alternating mountain ranges and sediment-filled basins, which specific type of fault dominates the landscape and has the hanging wall consistently dropping downward relative to the footwall along steeply dipping planes?

  • Reverse fault

  • Thrust fault

  • Strike-slip fault

  • Normal fault

Explanation

Normal faults dominate extensional tectonic settings where the lithosphere is pulled apart, allowing the hanging wall to collapse downward under gravity along faults dipping 50–70°. This process creates horst (uplifted blocks) and graben (down-dropped basins) topography, most spectacularly seen in the Basin and Range Province of the western United States and the East African Rift, where continued stretching will eventually split the continent and form a new ocean basin.
9.

In a continental-continental collision zone where two plates of similar density and thickness are forced together over millions of years, which type of fault would most likely accommodate the intense horizontal compression by shortening the crust and thrusting older rocks over younger ones along a low-angle plane?

  • Normal fault

  • Strike-slip fault

  • Reverse fault

  • Thrust fault

Explanation

When two buoyant continental plates collide, neither can easily subduct because of their low density, so the crust thickens dramatically through folding and faulting. Thrust faults, characterized by dips typically less than 30°, allow huge slabs of crust to be shoved horizontally for tens to hundreds of kilometers over adjacent rocks. These faults stack layers like a deck of cards pushed together, building massive mountain ranges such as the Himalayas, where Precambrian rocks now rest atop much younger sedimentary sequences due to the ongoing India-Eurasia collision that began 50 million years ago.
10.

What drives the movement of tectonic plates at divergent boundaries?

  • Slab pull

  • Ridge push

  • Mantle drag

  • Hotspot traction

Explanation

At divergent boundaries, ridge push is the primary mechanism driving plate movement. The elevated mid-ocean ridge, created by upwelling magma, acts like a sloping hill; gravity causes the newly formed, warm oceanic crust to slide away from the ridge crest on both sides. This process, combined with seafloor spreading, continuously pushes the plates apart and contributes significantly to global plate motion.

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