Seventh Grade Science Question Preview (ID: 37266)
Texas 7.8A, 7.8B, 7.8C.
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U-shaped valley formation is a result of what?
a) wind
b) lava
c) sand
d) glaciers
The Texas High Plains region does not receive much rain. It is reasonable to predict that this region, compared to other ecoregions, would have
a) less soil erosion
b) larger river deltas
c) many mountains
d) sandy beaches
What explains are hoodoos are formed?
a) Different types of rock weather at different rates when exposed
b) Wind speeds vary greatly over time
c) Ancient rivers deposited sediments at different rates over time
d) Glacier movements eroded the rock at different rates
In Galveston, the beaches are often exposed to hurricanes originating in the Gulf of Mexico. It is reasonable to predict that hurricane activity may
a) create new rivers in Galveston
b) move sand from the each to offshore sand bars
c) cause local earthquakes after storms
d) create new river deltas along the beach
From the distinct shapes of sand dunes and their features in a desert, a geologist could most likely determine which of the following?
a) direction of the prevailing winds
b) daily high and low temperatures
c) amount of water nearby
d) age of the formations
Which ecoregion is most vulnerable to wind erosion from hurricanes originating in the Gulf of Mexico?
a) Trans-Pecos/Mountains and Basins
b) Blackland Prairies
c) Edward's Plateau/Llano Uplift
d) Gulf Coast Prairies and Marshes
The Gulf Prairies and Marshes ecoregion experiences significant soil erosion. One would expect the climate in this region to be
a) dry and hot
b) cold and snowy
c) wet and rainy
d) warm and humid
The tall rock formations with smooth surfaces in Big Bend National Park were formed over time by
a) rock deposition
b) water erosion
c) local vegetation
d) wind weathering
The Brazos River is the longest river in Texas, empty ing into the Gulf of Mexico. What type of land formation would you expect to find where the river deposits sediments as it reaches the Gulf?
a) a cave
b) a mountain
c) a delta
d) a valley
In the Edwards Plateau, the limestone rocks are highly vulnerable to chemical and physical weathering. Which of the following land formations would be expected in this area?
a) canyons
b) lakes
c) rivers
d) caves
What is a possible effect of severe beach erosion?
a) Deltas will increase in size
b) Boulders will be carried inland
c) Sand bars will form off shore
d) Canyons will be created near by
High rains cause the flow in a river to increase. The increase in the river’s flow will most likely have which of the following effects on the environment?
a) The banks of the river will experience increased erosion.
b) The river will deposit less material onto its delta
c) The path of the river will become more crooked
d) The river will dry out completely in a few days
Sand bars are large deposits of sand that appear close to the shoreline of a beach. Which of the following processes is responsible for creating sand bars?
a) Wave action and currents
b) Constant light breezes
c) Hurricane precipitation
d) Aquatic organism activity
Which of the following is NOT an example of physical or mechanical weathering?
a) ice wedging (water freezing and thawing in the cracks of rocks)
b) breaking concrete with a jackhammer
c) abrasion (sand-blasting) of rocks by wind
d) weakening of rock due to oxidation (rust formation) of minerals
Which is NOT an example of chemical weathering?
a) oxidation (rust formation) of minerals weakening and breaking rock
b) carbonic acid dissolving limestone
c) acid rain changing the chemical composition of rock
d) abrasion (sand blasting) of rock
Which is NOT an example of organic/biological weathering?
a) Lichens dissolving rock
b) Plant chemicals weakening and dissolving rock
c) Plants breaking through the concrete sidewalk
d) water smoothing canyon walls
Which is NOT a type of weathering that contributes to changes in the Earth's surface?
a) physical/mechanical weathering
b) biological/organic weathering
c) chemical weathering
d) topographical weathering
Which of the 10 ecoregions in Texas does San Antonio belong to?
a) Gulf Coast Prairies and Marshes
b) Trans-Pecos Region
c) Edward's Plateau
d) Blackland Prairie
What factor did NOT contribute to Texas being rich in natural gas and oil?
a) Texas was at one time underwater
b) Texas had many layers of salt deposits
c) Remains of organisms underwent compaction, and cementation
d) weathering and erosion
How have humans impacted the various ecoregions?
a) increasing agricultural use of land
b) increasing the water demand and depleting aquifers
c) adding pollution to watersheds
d) adding water to the aquifers, rivers, lakes, and streams
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