D859 General Geology, catalog number EDUC 3306, is the three-CU course on Earth materials, surface processes and the tectonic forces behind both. Geology is one of the few sciences where a single theory explains most of the syllabus, and students who learn plate tectonics properly find that mountain belts, earthquake distributions, volcanic chains, rock types and ocean basins stop being separate chapters. Students who learn minerals first, as a list of properties, tend to find the course endless.
One theory, most of the course
Plate tectonics is the spine. Plates move, and what happens at their edges determines nearly everything a geology course covers. Where plates pull apart, molten rock rises and new ocean floor forms. Where they collide, one may descend beneath the other, producing deep earthquakes, chains of volcanoes and mineral changes under pressure. Where continents meet, crust thickens into mountains. Where plates slide past each other, shallow earthquakes cluster along the boundary. Learn the four boundary types with their consequences, and half the course becomes a matter of identifying which setting a question is describing.
The rock cycle is the second organising idea, and it is a cycle rather than a list. Igneous rock forms when molten material cools, and where it cools decides the crystal size. Weathering and erosion move fragments to a place of deposition, where burial and compaction produce sedimentary layers. Heat and pressure alter existing rock without melting it, producing metamorphic textures that record the conditions they were formed under. Every rock is a record of a process, and identification questions become reasoning questions once you read them that way.
Deep time is the third, and it is the concept people find hardest to hold. The principles are simple: layers accumulate with the oldest at the bottom unless something disturbed them, a feature that cuts across another is younger than what it cuts, and gaps in the record mark missing time. Radiometric dating puts numbers on those relationships using known decay rates. The difficulty is not the logic but the scale, and the fix is repeated practice reading sequences rather than reading about them.
Planning the work from your Course of Study
The scoring detail sits in your Course of Study rather than in the public catalog. Read it before allocating study time, since a written geology deliverable and a proctored exam demand different preparation. Where written work is scored, each aspect is judged alone and needs a 2, and geology aspects usually separate identification from interpretation, which means both need their own visible sections.
The word budget, worked. Assume five scored aspects and directions asking for about 1,500 words. Reserve 110 for framing the site or specimen and 90 for a close, leaving roughly 1,300, or 260 an aspect. Then move weight: any aspect asking you to interpret history from evidence takes an extra 65 words, taken from the aspects that only ask for description. In geology the identification is a sentence and the story it implies is a paragraph.
The study budget, worked. Around fifty hours across three competency units. Give thirty percent to plate tectonics and its consequences, twenty-five percent to rocks and minerals as records of process, twenty percent to surface processes including water, ice and mass movement, fifteen percent to geological time and dating, and ten percent to reading maps and cross-sections. That last block is small and is the one most often skipped, and it is where a surprising share of assessment questions live.
A study structure that fits general geology
This order works whether the course is assessed by written work, by a proctored objective assessment or by both.
| Stage | The move | What it prevents |
|---|---|---|
| Fix the boundaries | Draw the four plate boundary types with their earthquakes, volcanoes and terrain | Learning tectonic features as unrelated facts |
| Read rocks as processes | For each rock type, state the conditions that produced its texture | Memorising specimen names with no reasoning attached |
| Practise relative dating | Order events in cross-sections using superposition and cross-cutting | Knowing the principles but freezing when given a diagram |
| Attach numbers to time | Work through decay and half-life problems until the arithmetic is automatic | Understanding dating qualitatively and failing the calculation |
| Follow the water | Trace erosion, transport and deposition through a river system | Treating surface processes as disconnected from sediment formation |
| Interpret maps | Read a geological map and describe what happened at that place | The skill most often assessed and least often practised |
| Retrieve, do not reread | Reconstruct a rock cycle diagram and a boundary diagram from memory | Recognition standing in for knowledge under assessment conditions |
Where your program includes field or specimen work, describe what you actually observed before you name it. Colour, grain size, layering and hardness first, identification second. That order is both better science and better writing.
Evidence craft when you write about geology
Geological writing is an argument from observation to history, and the joins have to be visible.
- Describe before interpreting. A rock described as fine grained with visible layering supports a conclusion; a rock named without description asks the reader to trust you.
- State the evidence for every event you claim. An unconformity is evidence of missing time; a cross-cutting intrusion is evidence of relative age.
- Use scale and units correctly, including the difference between thousands and millions of years, which is the most common numerical slip in the subject.
- Cite maps, survey data and any published section you rely on, in APA where directions require it.
- Keep confidence proportionate. Some geological histories are well constrained and others are one plausible reading among several, and saying which is which reads as expertise.
- Where a specimen or site is your own observation, record location and date, because unlocated observations cannot be checked.
- Give orientation data where structure matters, since the direction a bed dips or a fault runs is often the evidence that decides between two possible histories for the same outcrop.
Teacher candidates should note how well this transfers. Describing before naming is exactly the habit secondary students need, and modelling it in your own writing makes it easier to teach later. It also produces a useful classroom rule: no name until three observations, which turns identification from a guessing game into evidence gathering.
What separates Competent from a return or a retake
Aspects score independently, so a geology return usually names an interpretation that arrived without its evidence.
- Tectonic setting is identified and used to explain the features present.
- Rocks are linked to the conditions that formed them rather than named.
- Relative dating principles are applied explicitly to the sequence given.
- Numerical ages carry units and appropriate precision.
- Observations are separated from interpretations in the writing.
- Maps, data and sources are cited.
Performance assessment work can be revised and resubmitted with no grade penalty, so a return costs time rather than standing, and in a six-month flat-rate term time is the whole budget. Where any part of this course is assessed by a proctored objective assessment, we prepare only: diagnostics, worked problems, map practice and an honest readiness call, with no sitting and no portal credentials requested.
Six mistakes that cost time in D859
- Starting with mineral identification. Without tectonics and the rock cycle first, minerals are a list; afterwards they are evidence.
- Learning boundary types without consequences. The point of each boundary is what it produces, and questions ask about the products.
- Skipping cross-section practice. Relative dating is easy to understand and easy to fumble under time pressure without repetition.
- Confusing half-life with total age. The arithmetic is simple and the setup is where students lose the marks.
- Naming rocks without describing them. An identification with no observed evidence behind it cannot support an interpretation aspect.
- Ignoring geological maps. They appear in assessment more than their share of study time suggests.
How support works on this course
Send your topic list or task directions with the scoring detail from your Course of Study. What comes back is a diagnostic that shows whether your gap is tectonics, time or materials, worked cross-sections and dating problems, guided practice reading geological maps, and writing that separates observation from interpretation the way the subject requires.
Most students who struggle in geology are trying to memorise a subject that is largely deducible. Two or three hours spent making plate tectonics genuinely usable tends to shorten the rest of the course substantially.
The other block worth targeting is the vocabulary, which is unusually dense in this subject and unusually rewarding to organise. Words such as intrusion, unconformity, foliation and clastic each name a process as well as a thing, so a glossary that records the process beside the term converts memorisation into reasoning. Built once, that glossary carries through the hazards course and into any Earth science curriculum work that follows it.
Questions students ask about D859
Is D859 the same course as EDUC 3306?
Do I need to collect rock samples for this course?
How does D859 connect to the hazards course?
Geology feeling like a list of specimens to memorise?
Send your topic list or task directions. You get a diagnostic, worked cross-sections and dating problems, and map practice that turns identification into interpretation.
Where D859 sits in WGU's programs
The July 2026 catalog places this code in 3 current WGU programs. Open a program page for the complete standard path and term positions. The live Degree Plan remains authoritative after transfer credit, substitutions, and mentor planning.
The assessments, one by one
The public catalog does not publish this course's PA/OA identity or task count. WGU Tutors publishes at most one PA manual per course and only from a WGU-controlled public rubric. Until that source exists, PA help begins from the student's real Course of Study and OA support remains preparation only.