PMA

Seafloor spreading occurs at divergent boundaries. Which statement BEST identifies the geologic process taking place at the point where seafloor spreading occurs

• a trench is forming

• new crust is forming

• oceanic crust is subducting

• a continental plate is subducting

The Mariana islands are volcanic islands that form an arc. The island arc is located in the North Pacific Ocean. These islands were formed by converging tectonic plates.

• melting of oceanic crust at mid-ocean ridge

• melting of oceanic crust at subduction zones

• production and deposition of magma from hot spots

• production and deposition of magma from rift valleys

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

A mountain showed the following change in profile over millions of years.

• The material weathered to form new sediments.

• The material was absorbed by plant roots.

• The material disintegrated from exposure to sunlight.

• The material was destroyed by chemical reactions.

Tags

NGSS.MS-ESS2-2

Which is the BEST evidence that rocks found deep underground were once exposed at the surface?

• The rocks have been melted by a magma.

• The rocks have been broken by faults.

• The rocks have been weathered by water.

• The rocks have been folded by pressure.

Which letter represents amplitude? (a)  

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS4-1

Before rock can become soil, it must undergo certain processes. One process in the formation of soil involves plants. How can plants chemically change rocks into soil?

• They weather rocks with acid.

• They strip the rocks of minerals.

• They break rocks into small pieces.

• They increase the density of the rocks.

Tags

NGSS.MS-LS2-3

A scientist was examining a large boulder that was covered with lichens (a combination of fungi and algae). He chipped a piece of the rock and placed it under a microscope. He observed that the surface of the rock was breaking down underneath the lichen. Which was the scientist MOST likely observing?

• the interaction between abiotic factors

• the effects of chemical weathering

• the process of deposition

• the effects of abrasion

Tags

NGSS.MS-ESS2-2

The Mid-Atlantic Ridge is a divergent fault on the floor of the Atlantic Ocean. The ridge itself forms a mountain chain that runs the length of the ocean floor from north to south. Which BEST describes the location of the youngest rock on the floor of the Atlantic Ocean?

• close to the east side of the Mid-Atlantic Ridge

• close to the west side of the Mid-Atlantic Ridge

• close to the top of the mountains on both sides of the Mid-Atlantic Ridge

• close to the base of the mountains on both sides of the Mid-Atlantic Ridge

Tags

NGSS.MS-ESS1-4

Which of the following is the MOST recent evidence of plate tectonics?

• volcanic activity and sea-floor spreading at the mid-ocean ridges

• similar fossils found on continents that are now separated by oceans

• the observation that the continents of South America and Africa fit together like in a puzzle

• similar rock formations found on different continents that are now separated by oceans

Tags

NGSS.MS-ESS2-3

Which is an example of mechanical weathering?

• a rockslide

• a volcano erupting

• an earthquake occurring

• a rock freezing and thawing