The density of the upper part of the lithosphere is

A. 1.2

B. 1.7

C. 2.0

D. 2.7

E. 3.0

Grit is a good example of

A. plutonic igneous rock

B. volcanic igneous rock

C. organically formed sedimentary rock

D. mechanically formed sedimentary rock

E. metarmorphic rock

Crater lakes are most likely to occur in

A. areas of active erosion

B. regions where subsidence is taking place

C. regions of extinct volcanoes

D. heavily faulted regions

E. areas of fold mountains

Yardangs are best described as

A. long narrow ridges of sand lying parallel to the direction of the prevailing winds

B. steep-side vertical bands of alternate hard and soft rocks aligned in the dircetion of the prevailing winds

C. flat, table-like masses with very resistant horizontal top layers and very steep sides

D. tabular, horizontal strata of alternate hard and soft rocks sculptured into a ridge and furrow landscape by wind

E. hills of sand formed by the accumulation of sand and shaped by the movement of winds

The seasonal variation in the volume of water in a river is known as its

A. direction

B. load

C. velocity

D. system

E. regime

The predominant action at the upper course of a river is

A. saltation

B. transportation

C. deposition

D. corrosion

E. corrasion

The word shore is best described as the zone

A. which extends from the coastlin to the sea

B. between high and low water levels at the coast

C. that marks the seaward limit of the coast

D. extending under the shallow water of the sea

E. covered by mangroves and lagoons