4th Grade Soil And Weathering Question Preview (ID: 51314)


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________________happens as water or wind gradually wears away rock by friction.
a) frost action
b) humus
c) abrasion
d) frost weathering

_______________happens when water in and around rocks and soil freezes and expands, breaking up the rocks.
a) frost weathering
b) abrasion
c) humus
d) none of the above

The layer that is mostly coarse, weathered rocks without humus is called---
a) topsoil
b) bedrock
c) subsoil
d) none of the above

The layer in which most plants grow is called---
a) subsoil
b) topsoil
c) bedrock
d) none of the above

_____________is made of weathered rock, water, air, and humus.
a) soil
b) a volcano
c) an earthquake
d) none of the above

The three sizes of weathered rock found in soil are ___________, silt, and clay.
a) landforms
b) water
c) sand
d) none of the above

Decayed plant and animal material in soil is called ---
a) humus
b) sand
c) silt
d) clay

A process of breaking down rocks into smaller pieces is called ----
a) erosion
b) landforms
c) weathering
d) upward

Mountains, canyons, reefs, and islands are some of the physical features on the earth's surface called---
a) weathering
b) landforms
c) soil
d) humus

The loose material on the surface of the earth is called---
a) soil
b) abrasion
c) landforms
d) volcanoes

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