What does Module 2 of the Virginia Earth Science SOL cover?

Module 2 covers Earth's materials, resources and plate tectonics, drawing on standards ES.3, ES.4, ES.5 and ES.7. It includes the definition of a mineral and how to identify minerals from physical properties (hardness, luster, streak, cleavage, density); the three rock types and the rock cycle that transforms them; Earth's interior layers and the seismic-wave evidence for a liquid outer core; plate tectonic theory, its evidence, mantle convection, and the features at divergent, convergent and transform boundaries; how earthquakes and volcanoes form and how to locate an epicenter; and renewable versus non-renewable energy and mineral resources with their environmental trade-offs.

How are the three rock types told apart?

Igneous rock forms when magma or lava cools and solidifies; slow cooling underground gives large crystals (granite), fast cooling at the surface gives small crystals or glass (basalt, obsidian). Sedimentary rock forms when sediment is compacted and cemented (lithification); it is often layered and contains fossils, and includes clastic rocks like sandstone and shale and chemical or organic rocks like rock salt and coal. Metamorphic rock forms when an existing rock is changed by heat and pressure without melting, and is foliated (banded, like slate and gneiss) or nonfoliated (like marble and quartzite). The rock cycle connects all three: any rock type can become any other.

What is the evidence for plate tectonics, and what drives the plates?

The evidence includes the jigsaw fit of continents like South America and Africa, matching fossils and rock belts across oceans, matching ancient climate clues, and seafloor spreading, where new crust forms at mid-ocean ridges so the ocean floor is youngest at the ridge and older away from it. The plates are pieces of the rigid lithosphere that move on the plastic asthenosphere, driven by convection currents in the mantle, where hot material rises and cooler material sinks. Wegener proposed continental drift but lacked a mechanism; the discovery of seafloor spreading supplied it and made plate tectonics the accepted theory.

How do you locate the epicenter of an earthquake?

P-waves travel faster than S-waves, so the time gap between their arrivals at a station grows with distance from the epicenter: a larger gap means a greater distance. Reading the gap on a travel-time graph gives the distance from one station, which is drawn as a circle of that radius around the station. One circle gives only a distance and two intersect at two points, so three stations are needed, because three distance circles intersect at a single point, the epicenter. This method is called triangulation.

What is the difference between a renewable and a non-renewable resource?

A renewable resource is replaced as fast as or faster than we use it, such as solar, wind, hydroelectric, geothermal and biomass energy. A non-renewable resource forms over geologic time, far more slowly than we use it, so the supply is effectively fixed; this includes the fossil fuels (coal, oil, natural gas), uranium, and most mineral ores. The test of renewability is the rate of replacement compared with use, so even trees and groundwater are renewable only if they are not consumed faster than they regrow or recharge. Energy choices involve trade-offs between reliability, cost and environmental impact.

VirginiaEarth and Environmental Science

Virginia Earth Science SOL Module 2: a complete overview of minerals, rocks, plate tectonics and resources for ES.3, ES.4, ES.5 and ES.7

A deep-dive guide to Module 2 of the Virginia Earth Science SOL: identifying minerals from their properties, the three rock types and the rock cycle, Earth's interior and the seismic-wave evidence, plate tectonics and the three boundary types, earthquakes and volcanoes, and renewable versus non-renewable resources.

Generated by Claude Opus 4.818 min readES.4, ES.5, ES.7Updated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

Jump to a section

What Module 2 actually demands
Minerals
Rocks and the rock cycle
Earth's interior and the evidence
Plate tectonics
Earthquakes, volcanoes and resources
Check your knowledge

What Module 2 actually demands

Module 2 is the solid Earth core of the Virginia Earth Science SOL: the materials Earth is made of (minerals and rocks), the structure and dynamics of the planet (the interior and plate tectonics), the hazards plate motion produces (earthquakes and volcanoes), and the resources we extract. It draws on standards ES.3, ES.4, ES.5 and ES.7. The recurring skill is connecting a property or feature to the process that produced it: a rock's texture to how it cooled, a wave's behavior to the layer it crossed, a boundary's features to the plate motion.

This guide ties together the matching dot-point pages, each with its own practice questions: minerals and their properties, the rock cycle and the three rock types, Earth's interior and seismic waves, plate tectonics and plate boundaries, earthquakes and volcanoes, and energy and mineral resources.

Minerals

A mineral is naturally occurring, inorganic, solid, of definite composition and orderly internal structure. That structure gives testable properties: hardness (Mohs scale), luster (metallic or nonmetallic), streak (powder color), cleavage versus fracture, color (least reliable), and density (fixed for a mineral). Minerals are grouped by composition, and the silicates (silicon and oxygen) are the largest, rock-forming group. Structure-based properties beat color, because color is changed by impurities; that is why pyrite and gold are told apart by streak.

Rocks and the rock cycle

The three rock types are defined by formation. Igneous rock cooled from magma or lava (slow, deep cooling gives large crystals; fast, surface cooling gives small ones). Sedimentary rock was compacted and cemented from sediment (often layered, holds fossils). Metamorphic rock was changed by heat and pressure without melting (foliated or nonfoliated). The rock cycle links them: melting then cooling makes igneous rock, weathering and lithification make sedimentary rock, and heat and pressure make metamorphic rock, with no fixed one-way path.

Earth's interior and the evidence

Earth is layered by composition (crust, mantle, core) and by physical state (rigid lithosphere, plastic asthenosphere, liquid outer core, solid inner core). Continental crust is thicker and less dense than oceanic crust. We know the interior from indirect evidence: P-waves pass through solids and liquids, S-waves only through solids, so the S-wave shadow zone proves the outer core is liquid, while the inner core stays solid under pressure. This is a textbook nature-of-science example.

Plate tectonics

The rigid plates ride on the asthenosphere, driven by mantle convection. The evidence is the continental fit, matching fossils and rocks, and seafloor spreading. At a divergent boundary plates move apart and make new crust (mid-ocean ridges); at a convergent boundary they collide and crust subducts or uplifts (trenches, volcanic arcs, mountains); at a transform boundary they slide past, causing earthquakes. Hot spots build island chains away from boundaries (Hawaii). Virginia's provinces, from the Coastal Plain to the Appalachian Plateau, record ancient collisions that built the Appalachians.

Earthquakes, volcanoes and resources

An earthquake's focus is underground and its epicenter is on the surface above; magnitude is the energy, intensity is the shaking felt. Triangulation from three stations (using the P-S time gap) locates the epicenter. Volcanoes form at boundaries and hot spots, and magma composition sets eruption style: thick felsic magma erupts explosively, runny mafic magma flows gently. Finally, resources split into renewable (solar, wind, hydro, geothermal) and non-renewable (fossil fuels, uranium, ores); each energy source carries a trade-off between reliability, cost and environmental impact, and Virginia's resources include coal, limestone, and sand and gravel.

Module 2 of the Virginia Earth Science SOL covers Earth's materials, resources and plate tectonics (ES.3, ES.4, ES.5, ES.7): minerals (defined by composition and orderly structure, identified by hardness, luster, streak, cleavage and density, with the silicates as the main group); the three rock types and the rock cycle (igneous from cooling, with crystal size set by cooling rate; sedimentary from compaction and cementation, layered and fossil-bearing; metamorphic from heat and pressure without melting); Earth's interior (crust, mantle, liquid outer core, solid inner core; lithosphere and asthenosphere), known from P-waves and S-waves and the S-wave shadow zone that proves a liquid outer core; plate tectonics (plates on the asthenosphere driven by mantle convection; divergent boundaries make crust, convergent boundaries subduct or uplift it, transform boundaries slide and quake; hot spots build island chains; Virginia's provinces record Appalachian collisions); earthquakes and volcanoes (focus versus epicenter, magnitude versus intensity, triangulation from three stations, and magma composition controlling eruption style); and renewable versus non-renewable resources with their environmental trade-offs.

Check your knowledge

A mix of recall and reasoning questions covering Module 2. Attempt them under timed conditions, then check against the solutions.

State the five parts of the definition of a mineral. (2 marks)
Explain why granite has larger crystals than basalt. (2 marks)
Name the three rock types and the process that forms each. (3 marks)
Explain how the S-wave shadow zone shows that the outer core is liquid. (2 marks)
State what happens at a divergent boundary and give one feature it forms. (2 marks)
Explain why three seismograph stations are needed to locate an epicenter. (2 marks)
Explain why thick, high-silica magma erupts explosively. (2 marks)
Classify each as renewable or non-renewable: coal, wind, uranium, hydroelectric. (2 marks)

Solutions

Q1: Naturally occurring, inorganic, solid, definite chemical composition, orderly internal (crystalline) arrangement of atoms.
Q2: Granite is intrusive (cooled slowly deep underground), so crystals had time to grow large; basalt is extrusive (lava cooled quickly at the surface), so crystals stayed small.
Q3: Igneous (magma or lava cools and solidifies), sedimentary (sediment is compacted and cemented), metamorphic (existing rock changed by heat and pressure without melting).
Q4: S-waves cannot travel through liquid and do not reach the far side of Earth (the shadow zone), so the outer core they fail to cross must be liquid.
Q5: Plates move apart; magma rises to form new oceanic crust, building a mid-ocean ridge (or a rift valley on land).
Q6: Each station's P-S time gap gives a distance, drawn as a circle; one circle gives a distance and two intersect at two points, so three circles are needed to meet at one point (the epicenter).
Q7: Thick (high-viscosity) felsic magma traps gas, so pressure builds and is released violently in an explosive eruption.
Q8: Non-renewable: coal, uranium. Renewable: wind, hydroelectric.

Sources & how we know this

2018 Science Standards of Learning (Earth Science) — Virginia Department of Education (2018)
SOL Practice Items (All Subjects) — Virginia Department of Education (2024)