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NC Science 8 - EOG Crash Course

2023 NC Standard Course of Study - All Three Strands

90:00
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0/45
Score

Physical Science

Matter classification, the Periodic Table, physical vs. chemical changes, conservation of mass, energy resources, and wave properties. Approximately 20% of your EOG score.

PS.8.1.1 PS.8.1.2 PS.8.1.3 PS.8.1.4 PS.8.1.5 ESS.8.4

EOG Test-Taking Tips

  • Read every word of each question carefully
  • Eliminate wrong answers first
  • Watch for "NOT" and "EXCEPT" in questions
  • Use the Periodic Table reference provided
  • Check units in math/wave speed questions
  • Diagrams show RELATIONSHIPS, not just facts

Key Vocabulary - Physical Science

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Diagram 1: Transverse Wave

PS.8.1 / ESS.8.4
Rest Line CREST TROUGH Wavelength (λ) - crest to crest Amplitude (rest line to crest) Frequency = waves per second (Hz) Higher frequency = SHORTER wavelength 1 2 3 4 5

Diagram 2: Bohr Atomic Model - Beryllium (Be, Atomic Number 4)

PS.8.1.2 - EOG Q23 type
BERYLLIUM (Be) Atomic Number: 4 (4 protons) Atomic Mass: ~9 (4p + 5n) Shell 1: max 2 electrons Shell 2: max 8 electrons Neutral: electrons = protons = 4 4p+ 5n0 nucleus e- e- Shell 1 (2 of 2 electrons) e- e- Shell 2 (2 of 8 electrons) = VALENCE Shell 1 Shell 2 CORRECT neutral Be atom: 4 protons, so exactly 4 electrons EOG Q23: Wendy showed 5 electrons - that error = "too many electrons" 1 2 3 4 5

Practice Questions - Physical Science

0 / 15 correct

Life Science

Disease and pathogens, ecosystems and food webs, energy flow (10% rule), symbiosis, natural selection, and evolution. Approximately 35% of your EOG score - second largest strand.

LS.8.1.1 LS.8.1.2 LS.8.2.1 LS.8.2.2 LS.8.2.3 LS.8.2.4 LS.8.3.1 LS.8.3.2

Key Vocabulary - Life Science

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Diagram 3: Energy Pyramid (10% Rule)

LS.8.2.3 / LS.8.2.4
PRODUCERS (Plants/Algae) 10,000 energy units - 100% Plants, algae, phytoplankton PRIMARY CONSUMERS 1,000 units - 10% Deer, Squirrel, Rabbit, Insects SECONDARY CONSUMERS 100 units - 1% Hawk, Snake, Fox TERTIARY 10 units - 0.1% Eagle, Wolf, Shark Only 10% transferred up each level 1 2 3 4 5

Diagram 4: Forest Food Web - EOG Style (Qs 17 & 19)

LS.8.2.1 / LS.8.2.2 / LS.8.2.4
SUN Energy PLANTS / OAK TREES PRODUCER (photosynthesis) DEER 1st Consumer (herbivore) SQUIRREL 1st Consumer (herbivore) RABBIT 1st Consumer (herbivore) HAWK 2nd Consumer (carnivore) WOLVES Introduced predator (preys only on deer) ARROW KEY Energy flow (prey to predator) Wolf predation (deer only) This food web matches EOG Q19: wolves introduced, only prey on deer 1 2 3 4 5 6

Practice Questions - Life Science

0 / 15 correct

Earth & Space Science

Hydrosphere and water distribution, water quality indicators, Earth history and rock layers, ocean currents, and energy resources. The LARGEST strand - approximately 44% of your EOG score.

ESS.8.1.1 ESS.8.1.2 ESS.8.2.1 ESS.8.2.2 ESS.8.3.1 ESS.8.3.2 ESS.8.4.1 ESS.8.4.3

Key Vocabulary - Earth & Space Science

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Diagram 5: Timber Falls Rock Layers (EOG Item Set, Qs 12-16)

ESS.8.1.1 / ESS.8.1.2
Timber Falls Cross-Section YOUNG OLD DOLOSTONE Hardness: 3 (Hardest) | MgCa(CO3)2 YOUNGEST layer - Stegosaurus fossil found here LIMESTONE Hardness: 2 (Medium) | CaCO3 Softer than dolostone - intermediate age CAVE formed by water eroding soft shale SHALE Hardness: 1 (Softest) | SiO2 OLDEST layer - Dalmanites trilobite fossils WATERFALL ROCK HARDNESS (EOG Timber Falls Reference) DOLOSTONE: 3 LIMESTONE: 2 SHALE: 1 Law of Superposition: Top = Youngest, Bottom = Oldest (in undisturbed layers) 1 2 3 4 5

Diagram 6: The Water Cycle (Hydrologic Cycle)

ESS.8.2.1
GROUNDWATER (Aquifer) OCEAN 97% salt water Evaporation Transpiration Precipitation Runoff Infiltration Condensation vapor rises, cools, forms cloud droplets 1 2 3 4 5 6 7

Diagram 7: Global Temperature Anomaly - 1960 to 2023

ESS.8.4.3 - EOG Q34 type
Global Temperature Anomaly (degrees C vs. 1951-1980 average) - Source: NASA GISS -0.4 -0.2 0.0 +0.2 +0.4 +0.6 +0.8 +1.0 +1.2 1960 1970 1980 1990 2000 2010 2020 2023 0 C base Cool / below avg Moderate warming Strong warming (>0.6 C) EOG Q34: What trend does this graph show? Answer: global temperatures have increased overall since 1960 1 2 3 4 5

Practice Questions - Earth & Space Science

0 / 15 correct