C165 Integrated Physical Sciences (SXO1)

55. What is the layer of Earth that has a soft, flowing portion that allows continents to slowly move?

• Outer core
• Crust
• Mantle
• Inner core

56. Which scenario demonstrates chemical weathering?

• Cycles of hot and cold temperature form cracks in rocks.
• Tree roots crack rocks as they grow into cracks.
• Oxygen reacts with iron in rocks to form rust.
• Blown sand grinds down exposed rocks in a desert.

57. Which scenario demonstrates deposition?

• A rain-induced mudslide removes a significant amount of the vegetation and soil from a hillside.
• A small river carves a deep canyon in limestone rock over a long period of time.
• The roots of a tree on a creek bank are exposed over time due to the flow of rainwater toward the creek.
• A pile of debris, including rocks and vegetation, forms at the bottom of a steep hill over time.

58. Which term is defined as the breakdown of rocks or soil as a result of compositional changes?

• Deposition
• Erosion
• Physical weathering
• Chemical weathering

59. An animal digs a burrow under a rock, which over time causes the rock to crack and split. Which process is occurring?

• Physical weathering
• Deposition
• Erosion
• Chemical weathering

60. Which percentage of Earth’s atmosphere is nitrogen (N2)?

• 5%
• 21%
• 55%
• 78%

61. Which layer of the atmosphere is 12–50 km from the surface of Earth?

• Stratosphere
• Troposphere
• Exosphere
• Thermosphere

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