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Seventh Grade Science
Test Description: Texas 7.8A, 7.8B, 7.8C
Instructions: Answer all questions to get your test result.
1) U-shaped valley formation is a result of what?
A
wind
B
sand
C
lava
D
glaciers
2) 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
larger river deltas
B
sandy beaches
C
less soil erosion
D
many mountains
3) What explains are hoodoos are formed?
A
Wind speeds vary greatly over time
B
Glacier movements eroded the rock at different rates
C
Different types of rock weather at different rates when exposed
D
Ancient rivers deposited sediments at different rates over time
4) 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
cause local earthquakes after storms
B
create new river deltas along the beach
C
move sand from the each to offshore sand bars
D
create new rivers in Galveston
5) 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
6) Which ecoregion is most vulnerable to wind erosion from hurricanes originating in the Gulf of Mexico?
A
Edward's Plateau/Llano Uplift
B
Blackland Prairies
C
Gulf Coast Prairies and Marshes
D
Trans-Pecos/Mountains and Basins
7) The Gulf Prairies and Marshes ecoregion experiences significant soil erosion. One would expect the climate in this region to be
A
wet and rainy
B
warm and humid
C
cold and snowy
D
dry and hot
8) 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
9) 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 valley
B
a delta
C
a mountain
D
a cave
10) 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
caves
D
rivers
11) What is a possible effect of severe beach erosion?
A
Sand bars will form off shore
B
Deltas will increase in size
C
Boulders will be carried inland
D
Canyons will be created near by
12) 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 river will deposit less material onto its delta
B
The river will dry out completely in a few days
C
The path of the river will become more crooked
D
The banks of the river will experience increased erosion.
13) 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
Hurricane precipitation
B
Aquatic organism activity
C
Wave action and currents
D
Constant light breezes
14) Which of the following is NOT an example of physical or mechanical weathering?
A
breaking concrete with a jackhammer
B
weakening of rock due to oxidation (rust formation) of minerals
C
abrasion (sand-blasting) of rocks by wind
D
ice wedging (water freezing and thawing in the cracks of rocks)
15) Which is NOT an example of chemical weathering?
A
carbonic acid dissolving limestone
B
acid rain changing the chemical composition of rock
C
oxidation (rust formation) of minerals weakening and breaking rock
D
abrasion (sand blasting) of rock
16) Which is NOT an example of organic/biological weathering?
A
Lichens dissolving rock
B
water smoothing canyon walls
C
Plants breaking through the concrete sidewalk
D
Plant chemicals weakening and dissolving rock
17) Which is NOT a type of weathering that contributes to changes in the Earth's surface?
A
topographical weathering
B
biological/organic weathering
C
physical/mechanical weathering
D
chemical weathering
18) Which of the 10 ecoregions in Texas does San Antonio belong to?
A
Trans-Pecos Region
B
Blackland Prairie
C
Edward's Plateau
D
Gulf Coast Prairies and Marshes
19) What factor did NOT contribute to Texas being rich in natural gas and oil?
A
weathering and erosion
B
Texas had many layers of salt deposits
C
Remains of organisms underwent compaction, and cementation
D
Texas was at one time underwater
20) How have humans impacted the various ecoregions?
A
adding water to the aquifers, rivers, lakes, and streams
B
increasing the water demand and depleting aquifers
C
increasing agricultural use of land
D
adding pollution to watersheds
*select an answer for all questions
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