1
The layer of soil that contains humus is called _____.
What is topsoil?
The layer in which most plants grow is called _____.
What is topsoil?
The layer that is made of solid, unweathered rock under layers of soil is called ____.
What is bedrock?
Small bits of weathered rock and other material are called ____.
What is sediment?
Sediment that is deposited at the mouth of a river makes the mouth of the river _____.
What is shallower?
The moving of bits of weathered material from one place to another is called _____.
What is erosion?
The dropping of sediment in a new place is called _____.
What is deposition?
An area of sediment that builds up at the mouth of a river is called _____.
What is a delta?
Soil is made of ____.
What is weathered rock, water, air, and humus?
Two types of landforms are _______.
What are mountains and dunes?
Three things that can cause rocks to weather are ____.
What are wind, water and plants?
The three sizes of weathered rock found in soil are ____.
What are sand, silt, and clay?
Two kinds of sudden erosion caused by gravity are ____.
What are landslides and avalanches?
occurs when water or wind gradually wears away rock by friction
What is abrasion?
the process of water in and around rocks and soil freezing and expanding, breaking up the rocks
What is frost weathering?
the rapid downhill movement of a large amount of soil and rocks
What is a landslide?
a huge sheet of ice that stays frozen all year
What is a glacier?
a sudden downhill movement of a large amount of snow and ice
What is a avalanche?
The process of breaking down rocks into smaller pieces is called ____.
What is weathering?
The soil layer that is mostly coarse, weathered rocks and does not contain humus is the _____.
What is subsoil?
Volcanoes and earthquakes can push land _____.
What is upward?
A moraine is a hill formed by a _____.
What is a glacier?
Decayed plant and animal material in soil is called ______.
What is humus?
_____ can pick up sediment and rocks.
What are glaciers?
______ where ponds and lakes form can be caused by glaciers.
What are U-shaped valleys?