Earth Science Ch 14 Review

Why are groins sometimes constructed along coastlines?

• they disrupt longshore currents, reducing beach erosion

• they help connect boulders or small islands that have been separated from the mainland

• to connect the coastline's legs to its torso

• to take advantage of the tides to create electricity

Which type of current would provide nutrients for productive fisheries

• upwelling

• downwelling

• Ekman spiral

• surface currents

What kinds of tides occur when the sun, moon, and earth are aligned, causing high tides to be higher, and low tides to be lower

• spring tides

• solar tides

• lunar tides

• Neap Tides

A mass of rock that has been cut off from the mainland by erosion

• stack

• spit

• tombolo

• sea-cave

When a wave approaches shore, its speed

• increases

• decreases

When a wave approaches shore, its wave height

• increases

• decreases

When a wave approaches shore, its wavelength

• increases

• decreases

The distance that wind blows over the water's surface in one direction is the

• fetch

• wavelength

• amplitude

• wave base

the horizontal distance from the crest of one wave to the next is the

• wavelength

• amplitude

• wave base

• trough

Subsurface currents that flow due to differences in salinity or temperature

• density currents

• tidal currents

• salinity currents

• Ekman spiral