Plate Tectonics
What is the name of the process that occurs at a convergent boundary when two continental plates push toward each other?
Folding and UPLIFT of the crust. When continental plates collide neither can sink, so rock gets pushed upward forming mountains like the Himalayas.
What shape is Earth's orbit around the Sun, and how does this affect Earth's distance from the Sun throughout the year?
Earth's orbit is an ELLIPSE a slightly oval shape. This means Earth's distance from the Sun changes throughout the year. It is closest around January 1 (perihelion) and farthest around July 1 (aphelion).
Both CO2 levels and global average temperature have increased since 1880. What type of relationship is shown between CO2 and temperature?
A POSITIVE correlation as CO2 increases, global temperature also increases. This suggests CO2 is contributing to rising global temperatures through the greenhouse effect.
Since 1970, 20% of the Amazon rain forest has been lost. What is the SINGLE largest cause of this deforestation according to the pie chart data?
Cattle ranches are the largest cause of Amazon deforestation, making up the biggest slice of the pie chart. Converting forest to pasture land for cattle removes more forest than any other single human activity.
The Law of Superposition states that in undisturbed rock layers, the oldest layer is at the bottom. If you find a fossil in the THIRD layer from the bottom out of five layers, is that fossil older or younger than a fossil found in the TOP layer?
The fossil in the third layer is OLDER than the fossil in the top layer. Lower layers formed first (were deposited earlier) in undisturbed sedimentary rock. The top layer is always the most recently deposited and therefore the youngest.
The Himalayas contain limestone fossils of sea creatures near the summit. What does this tell us about the history of that rock?
The limestone was once deposited on an ancient sea floor. When the Indian Plate and Eurasian Plate collided, that sea floor rock was pushed upward thousands of meters to form the mountaintops.
When is gravitational attraction between Earth and the Sun the GREATEST, and why?
Gravitational attraction is greatest around January 1 when Earth is CLOSEST to the Sun. Gravity increases as distance decreases the shorter the distance between two objects, the stronger the gravitational pull between them.
Of the three fossil fuels (coal, natural gas, oil), which releases the MOST carbon dioxide per joule of energy used, and what problem does this create?
COAL releases the most CO2 per joule of energy. This is a problem because CO2 is a greenhouse gas that traps heat in Earth's atmosphere, contributing to global warming and climate change.
A scientist wants to track deforestation in the Amazon over the next 20 years. Why would satellites be a better monitoring tool than sending people into the forest to count trees?
Satellites can observe the ENTIRE Amazon at regular intervals from space. The Amazon is too large and remote for ground teams to monitor completely. Satellites provide consistent, large-scale, long-term data that ground methods cannot match.
An igneous dike cuts through three sedimentary rock layers. Using the Law of Cross-Cutting Relationships, is the dike older or younger than the rock layers it cuts through?
The igneous dike is YOUNGER than all three rock layers it cuts through. The Law of Cross-Cutting Relationships states that any feature that cuts through existing rock must have formed AFTER those rocks already existed. You cannot cut through something that does not yet exist.
What are the THREE types of plate boundaries, and which one forms mountain ranges by collision?
Convergent (plates collide), Divergent (plates move apart), and Transform (plates slide past). CONVERGENT boundaries where continental plates meet form mountain ranges like the Himalayas.
Earth is farthest from the Sun in July, yet the Northern Hemisphere experiences summer in July. What DOES cause Earth's seasons?
Seasons are caused by Earth's AXIAL TILT, not distance from the Sun. In June, the Northern Hemisphere is tilted TOWARD the Sun, receiving more direct rays. In December it is tilted AWAY, receiving indirect rays. Distance from the Sun is not the cause.
Explain how the GREENHOUSE EFFECT works. Why does more CO2 in the atmosphere lead to higher global temperatures?
the Sun's energy passes through the atmosphere and warms Earth's surface. Earth's surface releases heat back out, but greenhouse gases like CO2 TRAP that heat and prevent it from escaping to space. More CO2 means more heat trapped, raising global temperature.
The Amazon rain forest has the highest diversity of plants and animals of any terrestrial ecosystem. If 20% has already been lost, what happens to species that lived only in that part of the forest?
Those species lose their habitat and may go extinct. Because the Amazon has such unique biodiversity, species that exist ONLY in the Amazon and nowhere else on Earth are permanently lost when their specific habitat is destroyed.
A geologist finds the same index fossil in rock layers located 500 miles apart. What can the geologist conclude about those two rock layers?
The two rock layers were formed during the SAME time period. Index fossils only lived during a specific span of geologic time, so finding the same index fossil in two different locations proves those rocks formed at approximately the same time, even if they are far apart.
f the Indian Plate is still slowly moving toward the Eurasian Plate today, what is happening to the Himalayas?
The Himalayas are still slowly growing taller today. As long as the plates continue converging, the crust continues to fold and push upward. This is why the Himalayas are the tallest mountains on Earth.
If Earth's orbit became more circular (equal distance from the Sun all year), what would happen to the variation in gravitational pull between Earth and the Sun?
The variation in gravitational pull would decrease and eventually disappear. A perfectly circular orbit means constant distance, which means constant gravitational force. The changing gravitational pull throughout the year exists BECAUSE of the elliptical orbit.
A student wants to investigate solutions to global climate change. They ask: 'What country emits the most CO2?' Is this the best research question? What would be a better question?
No. Knowing which country emits the most does not identify a solution. A better question is: What human activities produce the most CO2? This directly identifies sources that could be reduced or replaced to lower emissions.
A farmer claims cutting down forest for a cattle ranch will create more economic value than leaving the forest standing. What scientific argument supports preserving the forest instead?
The rain forest provides ecosystem services like absorbing CO2, regulating rainfall, preventing soil erosion, and maintaining biodiversity. Once destroyed, these services are lost permanently. The long-term cost of losing these services likely exceeds short-term farming profits.
A rock cross section shows: sandstone on top, then shale, then limestone at the bottom. A fault cuts through all three layers. A volcanic intrusion cuts only through the limestone. List ALL features from oldest to youngest.
From oldest to youngest: Limestone formed first (bottom layer), then Shale, then Sandstone. The Volcanic intrusion formed next (it only cuts through limestone, meaning limestone was already there but shale and sandstone were not yet deposited). The Fault formed last because it cuts through ALL layers.
Why does a convergent boundary between two CONTINENTAL plates produce mountains, but a convergent boundary between an oceanic and continental plate produces a different feature?
Continental crust is too thick and buoyant to sink into the mantle, so it folds upward making mountains. Oceanic crust is denser and thinner, so it subducts (sinks) under the continental plate, creating a subduction zone and trench instead.
A scientist claims that Earth's changing distance from the Sun is what causes the change in tropical storm frequency between summer and winter. Is this correct? Explain using evidence.
No, this is INCORRECT. Earth is actually FARTHEST from the Sun during Northern Hemisphere summer (July) when tropical storm activity peaks. Storms increase in summer due to DIRECT SUNLIGHT warming ocean temperatures, not because of gravitational changes from Earth's orbit.
Natural gas produces less CO2 per joule than coal. If the US switched completely from coal to natural gas, would this solve the climate change problem? Explain your reasoning.
No, it would help but NOT solve the problem. Natural gas still produces CO2, just less per joule. CO2 would still accumulate in the atmosphere and continue contributing to warming. True solutions require switching to NON-fossil fuel energy sources like solar, wind, or nuclear.
Compare the effectiveness of these three monitoring methods for tracking Amazon deforestation: counting logging trucks, measuring agricultural exports, and satellite imaging. Rank them and explain why.
Satellite imaging gives direct visual evidence of forest area change across the entire Amazon. Second: Measuring agricultural exports shows how much farm output is generated but not exactly where forest was lost. Worst: Counting logging trucks misses legal clearing, cattle ranching (the top cause), and only captures a fraction of deforestation activity.
Explain why the Law of Superposition alone is not always enough to determine the relative age of rock features, and what additional laws or principles must be used.
Superposition only works for undisturbed horizontal sedimentary layers. It cannot determine the age of igneous intrusions, faults, folds, or metamorphic rocks because those features cut ACROSS layers rather than being deposited on top. The Law of Cross-Cutting Relationships and the Principle of Inclusions must also be used to date features that disrupt existing rock layers.