MiSTAR Unit 7.2A Test Review (2023-24)

Front

What causes the pattern of rock ages on either side of a spreading ridge?

Back

New volcanic activity fills the center of the ridge, pushing older rock outwards. Over time, the oldest rock is pushed further from the ridge, while the newest rock forms right over the ridge.

Front

Which island in the Hawaiian chain is the oldest?

Back

Kauai.

Front

What occurs at a spreading ridge in terms of matter and energy flow?

Back

Molten rock flows from the mantle to the crust, where it cools and crystallizes to form new rock at the center of the fissure volcano.

Front

Which letter corresponds with the oldest rock in a given diagram?

Back

O.

Front

How do Figures 1 and 2 provide evidence of plate motion?

Back

Plate motion combined with volcanic activity produces bands of rock that are parallel to the ridge; the oldest bands are furthest from the ridge, and the youngest rock is over the spreading ridge.

Front

What is the role of volcanic activity at a spreading ridge?

Back

Volcanic activity creates new rock as molten material rises from the mantle and solidifies at the surface.

Front

Explain the relationship between rock age and distance from a spreading ridge.

Back

The age of the rock increases with distance from the spreading ridge; the newest rock is located at the ridge, while older rock is found further away.

Front

What geological feature is formed at a spreading ridge?

Back

A fissure volcano is formed at a spreading ridge as molten rock erupts and solidifies.

Front

What is the significance of the term 'spreading ridge' in plate tectonics?

Back

A spreading ridge is a divergent boundary where tectonic plates move apart, allowing magma to rise and create new crust.

Front

How does the process of seafloor spreading contribute to the theory of plate tectonics?

Back

Seafloor spreading provides evidence for the movement of tectonic plates, as new oceanic crust is formed at spreading ridges and older crust is pushed away.