3. how were the pacific ranges formed? which tectonic plates were involved?
4. watch the youtube video at this destination about the eruption of mount st. helens, then describe the impact the eruption had on the region in 30 - 35 words.
destination #8: death valley
4. how does the rain shadow effect help to create a desert?
5. what are two characteristics of a desert climate?
destination #9: the rocky mountains
6. what are cordilleras?
7. what is a divide?
8. which direction do rivers in california flow?
destination #10: the great plains
9. what is the relative location of the great plains? (you must include two physical features in your answer)
10. what causes the great plains to have a continental climate?

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Accepted Answer

### Question 4: How does the rain shadow effect help to create a desert?
# Brief Explanations:
The rain shadow effect occurs when moist air from an ocean is forced to rise over a mountain range. As the air rises, it cools and condenses, causing precipitation on the windward (ocean - facing) side of the mountains. By the time the air crosses over the mountain range and descends on the leeward (opposite) side, it has lost most of its moisture. This dry, descending air warms adiabatically, which further reduces its ability to hold moisture. The lack of precipitation on the leeward side, combined with the warm and dry conditions, leads to the formation of a desert.
# Answer:
Moist air rises over mountains (windward side), loses moisture via precipitation. Dry air descends on leeward side, warms, holds little moisture, creating arid conditions that form a desert.

### Question 5: What are TWO characteristics of a desert climate?
# Brief Explanations:
Desert climates are known for their low precipitation levels, usually receiving less than 250 millimeters of rain per year. Another characteristic is high temperature variability, with very hot days (often exceeding 30°C or 86°F) and relatively cool nights due to the lack of cloud cover and vegetation to retain heat. Also, desert climates have low humidity as there is little moisture in the air.
# Answer:
1. Low precipitation (usually <250 mm/year).
2. High daily temperature variability (hot days, cool nights).

### Question 6: What are cordilleras?
# Brief Explanations:
A cordillera is a major system of mountain ranges that are connected or related in origin. These mountain ranges are often formed by tectonic activity, such as the collision of tectonic plates. For example, the North American Cordillera includes the Rocky Mountains, the Sierra Nevada, and other associated mountain ranges.
# Answer:
A cordillera is a major system of connected/related mountain ranges, often formed by tectonic activity (e.g., North American Cordillera includes Rockies, Sierra Nevada).

### Question 7: What is a divide?
# Brief Explanations:
A divide is a ridge or an area of high ground that separates the drainage basins of different rivers. It determines the direction in which rivers flow, with rivers on one side of the divide flowing towards one body of water (e.g., an ocean) and rivers on the other side flowing towards a different body of water. For example, the Continental Divide in North America separates rivers that flow into the Pacific Ocean from those that flow into the Atlantic Ocean (or its associated seas like the Gulf of Mexico).
# Answer:
A divide is a high - ground ridge/area that separates river drainage basins, determining river flow directions (e.g., Continental Divide separates Pacific - and Atlantic - bound rivers).

### Question 8: Which direction do rivers in California flow?
# Brief Explanations:
Most rivers in California flow from the high - elevation mountain ranges (such as the Sierra Nevada and the Cascade Range) towards the lower - elevation areas, mainly westward towards the Pacific Ocean. This is because the topography of California has higher elevations in the east (due to the mountain ranges) and lower elevations in the west near the coast. Gravity causes the water to flow downhill from these high - elevation areas to the lower - elevation coastal regions.
# Answer:
Rivers in California generally flow westward, from high - elevation mountain ranges (e.g., Sierra Nevada, Cascades) to the Pacific Ocean (downhill to lower elevations).

### Question 9: What is the RELATIVE location of the Great Plains? (You must include TWO physical features in your answer)
# Brief Explanations:
The Great Plains are located to the east of the Rocky Mountains and to the west of the Mississippi River. The Rocky Mountains form a major mountain range in the western part of North America, and the Mississippi River is a large river system in the central - eastern part of the continent. The Great Plains are also situated between the Canadian Prairies to the north and the Gulf of Mexico - adjacent regions to the south.
# Answer:
The Great Plains are east of the Rocky Mountains and west of the Mississippi River (also north of the Gulf - adjacent regions, south of Canadian Prairies).

### Question 10: What causes the Great Plains to have a continental climate?
# Brief Explanations:
The Great Plains have a continental climate mainly because of their distance from large bodies of water (like oceans). Large bodies of water have a moderating effect on climate, keeping temperatures more stable and increasing humidity. Since the Great Plains are far from oceans, they are not influenced by the maritime air masses that coastal areas experience. Additionally, the flat topography of the Great Plains allows for the unimpeded movement of continental air masses, which can bring extreme temperature variations (very hot summers and very cold winters) and relatively low precipitation.
# Answer:
The Great Plains have a continental climate due to their distance from oceans (losing maritime influence) and flat topography (allowing continental air mass movement, causing extreme temp. variation and low precipitation).

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Question 4: How does the rain shadow effect help to create a desert?

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Question 5: What are TWO characteristics of a desert climate?