2018 8th Grade PJHE Science Final

Identify the error in the topographic map below.

• Contour lines cannot run off a map

• Contour lines cannot cross

• All the lines should have numbers on them

• The lines should all be the same distance apart

On a topographic map, the difference in elevation between two side-by-side contour lines is called the contour interval. Because contour lines show differences in elevation ______.

• contour intervals cannot be the same

• contours don’t have numbers

• contour lines can never cross

• they can only show steep elevations

Which of the following has the potential for the most erosion?

• Water flowing across a flatland

• Wind blowing materials in the air, against the force of gravity

• Wind blowing materials down a slope

• Water flowing down a steep slope

Low-pressure systems are usually associated with ____________.

• air moving inward and rising, forming clouds and rain

• cool dry air

• air sinking and spreading out on the surface so clouds don’t form

• sunny weather

Very severe thunderstorms can form when a ____ meets a large continuous supply of warm air to lift and condense.

• cold front

• warm air mass

• warm front

• tornado

At an oceanic-oceanic convergent boundary, ____.

• new crust is created

• old crust is recycled by subduction

• old crust is deformed or fractured

• plates side past one another

Convection currents transfer thermal energy ____.

• between continents

• from cooler regions to warmer regions

• from warmer regions to cooler regions

• as a result of buoyancy

The downward part of a convection current causes a sinking force that ____.

• pulls tectonic plates toward one another

• moves plates apart from one another

• lifts and splits the lithosphere

• creates a divergent boundary

The rising and spreading of magma during seafloor spreading results in ____.

• magnetic reversals

• new ocean crust

• subduction

• plates colliding

Features found at divergent boundaries include ____.

• ocean ridges

• deep-sea trenches

• crumpled mountains

• island arc volcanoes