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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
lava
B
glaciers
C
wind
D
sand
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
sandy beaches
B
larger river deltas
C
less soil erosion
D
many mountains
3) What explains are hoodoos are formed?
A
Different types of rock weather at different rates when exposed
B
Ancient rivers deposited sediments at different rates over time
C
Wind speeds vary greatly over time
D
Glacier movements eroded the rock at different rates
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
create new rivers in Galveston
B
create new river deltas along the beach
C
move sand from the each to offshore sand bars
D
cause local earthquakes after storms
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
daily high and low temperatures
B
amount of water nearby
C
direction of the prevailing winds
D
age of the formations
6) Which ecoregion is most vulnerable to wind erosion from hurricanes originating in the Gulf of Mexico?
A
Gulf Coast Prairies and Marshes
B
Blackland Prairies
C
Trans-Pecos/Mountains and Basins
D
Edward's Plateau/Llano Uplift
7) 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
wet and rainy
C
warm and humid
D
cold and snowy
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
wind weathering
D
local vegetation
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 delta
B
a mountain
C
a valley
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
lakes
B
rivers
C
canyons
D
caves
11) What is a possible effect of severe beach erosion?
A
Boulders will be carried inland
B
Deltas will increase in size
C
Sand bars will form off shore
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 path of the river will become more crooked
B
The river will dry out completely in a few days
C
The river will deposit less material onto its delta
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
Aquatic organism activity
B
Wave action and currents
C
Hurricane precipitation
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
abrasion (sand-blasting) of rocks by wind
C
ice wedging (water freezing and thawing in the cracks of rocks)
D
weakening of rock due to oxidation (rust formation) of minerals
15) Which is NOT an example of chemical weathering?
A
abrasion (sand blasting) of rock
B
carbonic acid dissolving limestone
C
acid rain changing the chemical composition of rock
D
oxidation (rust formation) of minerals weakening and breaking rock
16) Which is NOT an example of organic/biological weathering?
A
water smoothing canyon walls
B
Plant chemicals weakening and dissolving rock
C
Plants breaking through the concrete sidewalk
D
Lichens 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
chemical weathering
D
physical/mechanical weathering
18) Which of the 10 ecoregions in Texas does San Antonio belong to?
A
Blackland Prairie
B
Edward's Plateau
C
Gulf Coast Prairies and Marshes
D
Trans-Pecos Region
19) What factor did NOT contribute to Texas being rich in natural gas and oil?
A
Texas had many layers of salt deposits
B
Remains of organisms underwent compaction, and cementation
C
Texas was at one time underwater
D
weathering and erosion
20) How have humans impacted the various ecoregions?
A
adding pollution to watersheds
B
increasing the water demand and depleting aquifers
C
adding water to the aquifers, rivers, lakes, and streams
D
increasing agricultural use of land
*select an answer for all questions
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