AnswersPARTA - EVP PGCPS BIOGEOCHEM CR FALL2026 - 798113Lab: Environmental Changes in a Watershed

Lab: Environmental Changes in a Watershed — Unit test Answers

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1
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Which is one source of the sediments that form sedimentary rocks?

A
chunks of coal
B
particles in new rocks
C
liquid magma
D
materials dissolved in solutions
2
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Which word identifies the agent that carries the energy released from earthquakes?

A
epicenter
B
focus
C
lithosphere
D
waves
3

Which statement explains one way that lakes form?

A
Lava flows block a river.
B
Streams flow into shallow areas.
C
Groundwater feeds into low-lying areas.
D
Grassy wetlands get covered by a stream.
4

Which part of the shallow ocean descends sharply away from the continental shelf?

A
abyssal plain
B
mid-ocean ridge
C
transitional zone
D
continental slope
5

Where are extrusive igneous rocks typically found?

A
in a canyon
B
in a riverbed
C
near a dormant volcano
D
deep under Earth’s surface
6

Which features form along all types of plate boundaries?

A
faults
B
rift valleys
C
mountains
D
ocean ridges
7

Which type of volcanic mountain has wide, gentle slopes?

A
rift
B
shield
C
composite
D
cinder cone
8

What percentage of Earth’s water is fresh water?

A
3 percent
B
25 percent
C
75 percent
D
97 percent
9

Which process forms sedimentary rock in the rock cycle after sediments accumulate and combine?

A
Sediments undergo heat and pressure.
B
Sedimentary rock weathers and erodes.
C
Sediments compact and cement together.
D
Sedimentary rock experiences cooling and melting.
10

Which statement describes divergent boundaries?

A
Divergent boundaries are found only on land.
B
Subduction occurs at divergent boundaries.
C
Plates move toward each other at divergent boundaries.
D
Magma flows from cracks in the crust at divergent boundaries.
11

A rock is found in an area that once had an active volcano and has since been affected by erosion. The rock has individual black and white crystals that are easy to see.Which other description fits the rock?

A
fine texture
B
cooled quickly
C
exposed to air and water
D
cooled inside the volcano
12

Which is one of the main categories of sedimentary rocks?

A
clastic
B
limestone
C
shale
D
sandstone
13

The image shows a cross section of a volcano.

Question illustration
A
1
B
2
C
3
D
4
14

Which sedimentary rock is burned to produce energy?

A
coal
B
iron ore
C
rock salt
D
limestone
15

Why is the unsaturated zone not filled with water?

A
It is below the water table and water stays above it.
B
It is clay and water pools above it.
C
It is granite and water flows around it.
D
It is permeable and water flows through it.
16

Which statement is an example of an observation a scientist would make to classify a rock?

A
A rock is larger than other rocks.
B
A rock was found in a stream.
C
A rock is formed from molten lava.
D
A rock cracks in half after a rainstorm.
17

According to the theory of plate tectonics, which is one feature that plates carry?

A
seafloor
B
inner core
C
lower mantle
D
asthenosphere
18

Study the image of this rock.

Question illustration
A
jagged
B
oval
C
round
D
smooth
19

Study this image of lithospheric plates.

Question illustration
A
Pacific, Eurasian, and African
B
African, North American, and South American
C
Eurasian, African, and South American
D
North American, Pacific, and African
20

The table shows the thickness, top density, and bottom density of the different layers of the Earth. Thickness (km)Density (g/cm3)Types of Rock FoundTopBottomCrust302.22.9Silicic rocksUpper mantle7203.44.4PeridotiteLower mantle2,1714.45.6Magnesium and silicon oxidesOuter core2,2599.912.2Iron+oxygenInner core1,22112.813.1Iron+oxygen

A
As depth increases, the density of the layers increases.
B
As depth increases, the density of the layers decreases.
C
As depth increases, the thickness of the layers increases.
D
As depth increases, the thickness of the layers decreases.

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